Audio digital resistor - Allicdata Electronics

Related Categories

< 1 2 3 4 5 >

Allicdata Part#	Mft.Part#	Company	Spec.	QTY.	Pricing(USD)
PCM1716E/2K-ND	PCM1716E/2K	Texas Instruments	View more Series: SoundPlus Packaging: Tape & Reel (TR) Part Status: Obsolete Type: DAC, Audio Number of Channels: 2 Resolution (Bits): 24 b Sampling Rate (Per Second): 96k Data Interface: IS Voltage Supply Source: Analog and Digital Voltage - Supply: 5V Operating Temperature: -25C ~ 85C Mounting Type: Surface Mount Package / Case: 28-SSOP (0.209", 5.30mm Width) Supplier Device Package: 28-SSOP Base Part Number: PCM1716	1000 Order	--
296-21537-2-ND	PCM1794ADBR	Texas Instruments	View more Packaging: Tape & Reel (TR) Part Status: Active Type: DAC, Audio Number of Channels: 3 Resolution (Bits): 24 b Sampling Rate (Per Second): 200k Data Interface: IS Voltage Supply Source: Analog and Digital Voltage - Supply: 3 V ~ 3.6 V, 5V Operating Temperature: -25C ~ 85C Mounting Type: Surface Mount Package / Case: 28-SSOP (0.209", 5.30mm Width) Supplier Device Package: 28-SSOP Base Part Number: PCM1794A	3333 Order	--
974-1061-2-ND	AK4373EN	AKM Semiconductor Inc.	View more Packaging: Tape & Reel (TR) Part Status: Active Type: DAC, Audio Number of Channels: 2 Resolution (Bits): 24 b Sampling Rate (Per Second): 48k Data Interface: DSP, IS Voltage Supply Source: Analog and Digital Voltage - Supply: 1.6 V ~ 3.6 V Operating Temperature: -30C ~ 85C Mounting Type: Surface Mount Package / Case: 32-WFQFN Exposed Pad Supplier Device Package: 32-QFN (5x5)	1000 Order	1000+: $1.0672 2000+: $1.0139 5000+: $0.9757
296-13072-5-ND	DSD1702E	Texas Instruments	View more Packaging: Tube Part Status: Active Type: DAC, Audio Number of Channels: 2 Resolution (Bits): 24 b Sampling Rate (Per Second): 200k Data Interface: DSD, PCM Voltage Supply Source: Analog and Digital Voltage - Supply: 3 V ~ 3.6 V, 5V Operating Temperature: -25C ~ 85C Mounting Type: Surface Mount Package / Case: 20-SSOP (0.154", 3.90mm Width) Supplier Device Package: 20-SSOP/QSOP Base Part Number: DSD1702	93 Order	--
NAU8502YG-ND	NAU8502YG	Nuvoton Technology Corporation of America	View more Packaging: Tray Part Status: Active Type: ADC, Audio Number of Channels: 6 Resolution (Bits): 24 b Data Interface: Serial Voltage Supply Source: Analog and Digital Voltage - Supply: 1.7 V ~ 3.6 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 32-WFQFN Exposed Pad Supplier Device Package: 32-QFN (5x5)	1000 Order	490+: $1.0054
296-23371-2-ND	PCM4104IPFBREP	Texas Instruments	View more Packaging: Tape & Reel (TR) Part Status: Obsolete Type: DAC, Audio Number of Channels: 4 Resolution (Bits): 24 b Sampling Rate (Per Second): 216k Data Interface: PCM Voltage Supply Source: Analog and Digital Voltage - Supply: 3 V ~ 3.6 V, 5V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 48-TQFP Supplier Device Package: 48-TQFP (7x7) Base Part Number: PCM4104	1000 Order	1+: $0
TLV320DAC23IPWR -ND	TLV320DAC23IPWR	Texas Instruments	View more Packaging: Tape & Reel (TR) Part Status: Active Type: DAC, Audio Number of Channels: 2 Resolution (Bits): 24 b Sampling Rate (Per Second): 8k ~ 96k Data Interface: IS, SPI Voltage Supply Source: Analog and Digital Voltage - Supply: 1.5V, 3.3V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 28-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 28-TSSOP Base Part Number: TLV320DAC23	1000 Order	2000+: $1.9456
296-15313-5-ND	PCM1792DB	Texas Instruments	View more Packaging: Tube Part Status: Not For New Designs Type: DAC, Audio Number of Channels: 3 Resolution (Bits): 24 b Sampling Rate (Per Second): 200k Data Interface: DSD, PCM Voltage Supply Source: Analog and Digital Voltage - Supply: 3 V ~ 3.6 V, 5V Operating Temperature: -25C ~ 85C Mounting Type: Surface Mount Package / Case: 28-SSOP (0.209", 5.30mm Width) Supplier Device Package: 28-SSOP Base Part Number: PCM1792	1000 Order	47+: $16.6015
PCM1728E/2K-ND	PCM1728E/2K	Texas Instruments	View more Series: SoundPlus Packaging: Tape & Reel (TR) Part Status: Obsolete Type: DAC, Audio Number of Channels: 3 Resolution (Bits): 24 b Sampling Rate (Per Second): 96k Data Interface: IS Voltage Supply Source: Analog and Digital Voltage - Supply: 5V Operating Temperature: -25C ~ 85C Mounting Type: Surface Mount Package / Case: 28-SSOP (0.209", 5.30mm Width) Supplier Device Package: 28-SSOP Base Part Number: PCM1728	1000 Order	1+: $0
296-15091-5-ND	PCM1791ADB	Texas Instruments	View more Packaging: Tube Part Status: Active Type: DAC, Audio Number of Channels: 1 Resolution (Bits): 24 b Sampling Rate (Per Second): 200k Data Interface: DSD, PCM Voltage Supply Source: Analog and Digital Voltage - Supply: 3 V ~ 3.6 V, 5V Operating Temperature: -25C ~ 85C Mounting Type: Surface Mount Package / Case: 28-SSOP (0.209", 5.30mm Width) Supplier Device Package: 28-SSOP Base Part Number: PCM1791	86 Order	--
296-43320-2-ND	PCM1794AQDBRQ1	Texas Instruments	View more Packaging: Tape & Reel (TR) Part Status: Active Type: DAC, Audio Number of Channels: 3 Resolution (Bits): 24 b Sampling Rate (Per Second): 192k Data Interface: IS, PCM Voltage Supply Source: Analog and Digital Voltage - Supply: 3 V ~ 3.6 V, 5V Operating Temperature: -25C ~ 85C Mounting Type: Surface Mount Package / Case: 28-SSOP (0.209", 5.30mm Width) Supplier Device Package: 28-SSOP	1000 Order	--
PCM1774RGPTG4-N D	PCM1774RGPTG4	Texas Instruments	View more Packaging: Tape & Reel (TR) Part Status: Active Type: DAC, Audio Number of Channels: 2 Resolution (Bits): 16 b Sampling Rate (Per Second): 50k Data Interface: DSP, IS Voltage Supply Source: Analog and Digital Voltage - Supply: 1.7 V ~ 3.6 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 20-VFQFN Exposed Pad Supplier Device Package: 20-QFN (4x4) Base Part Number: PCM1774	1000 Order	250+: $1.5338
AD1955ARSZ-ND	AD1955ARSZ	Analog Devices Inc.	View more Packaging: Tape & Reel (TR) Part Status: Active Type: DAC, Audio Number of Channels: 2 Resolution (Bits): 24 b Sampling Rate (Per Second): 192k Data Interface: DSD, PCM Voltage Supply Source: Analog and Digital Voltage - Supply: 5V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 28-SSOP (0.209", 5.30mm Width) Supplier Device Package: 28-SSOP Base Part Number: AD1955	3000 Order	--
PCM69AU-ND	PCM69AU	Texas Instruments	View more Packaging: Tube Part Status: Obsolete Type: DAC, Audio Number of Channels: 2 Resolution (Bits): 18 b Data Interface: PCM Voltage Supply Source: Analog and Digital Voltage - Supply: 5V Operating Temperature: -25C ~ 85C Mounting Type: Surface Mount Package / Case: 20-SOIC (0.295", 7.50mm Width) Supplier Device Package: 20-SOIC Base Part Number: PCM69	1000 Order	--
974-1035-ND	AK5388EQ	AKM Semiconductor Inc.	View more Packaging: Tray Part Status: Not For New Designs Type: ADC, Audio Number of Channels: 4 Resolution (Bits): 24 b Sampling Rate (Per Second): 8k ~ 216k Data Interface: IS Voltage Supply Source: Analog and Digital Voltage - Supply: 3 V ~ 3.6 V, 4.75 V ~ 5.25 V Operating Temperature: -10C ~ 70C Mounting Type: Surface Mount Package / Case: 44-LQFP Supplier Device Package: 44-LQFP (10x10) Base Part Number: AK5388	2726 Order	--
PCM1717E/2K-ND	PCM1717E/2K	Texas Instruments	View more Series: SoundPlus Packaging: Tape & Reel (TR) Part Status: Obsolete Type: DAC, Audio Number of Channels: 3 Resolution (Bits): 18 b Sampling Rate (Per Second): 48k Data Interface: IS Voltage Supply Source: Analog and Digital Voltage - Supply: 2.7 V ~ 5.5 V Operating Temperature: -25C ~ 85C Mounting Type: Surface Mount Package / Case: 20-SSOP (0.209", 5.30mm Width) Supplier Device Package: 20-SSOP Base Part Number: PCM1717	1000 Order	--
UDA1334TS/N1,11 8-ND	UDA1334TS/N1,11 8	NXP USA Inc	View more Packaging: Tape & Reel (TR) Part Status: Obsolete Type: DAC, Audio Number of Channels: 3 Resolution (Bits): 24 b Sampling Rate (Per Second): 100k Data Interface: IS Voltage Supply Source: Analog and Digital Voltage - Supply: 1.8 V ~ 3.6 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 16-LSSOP (0.173", 4.40mm Width) Supplier Device Package: 16-SSOP Base Part Number: UDA1334	1000 Order	1+: $0
NAU8501YG-ND	NAU8501YG	Nuvoton Technology Corporation of America	View more Packaging: Tray Part Status: Active Type: ADC, Audio Number of Channels: 6 Resolution (Bits): 24 b Data Interface: Serial Voltage Supply Source: Analog and Digital Voltage - Supply: 1.7 V ~ 3.6 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 32-WFQFN Exposed Pad Supplier Device Package: 32-QFN (5x5)	1000 Order	--
PCM1718E/2K-ND	PCM1718E/2K	Texas Instruments	View more Series: SoundPlus Packaging: Tape & Reel (TR) Part Status: Obsolete Type: DAC, Audio Number of Channels: 2 Resolution (Bits): 18 b Sampling Rate (Per Second): 48k Data Interface: IS Voltage Supply Source: Analog and Digital Voltage - Supply: 2.7 V ~ 5.5 V Operating Temperature: -25C ~ 85C Mounting Type: Surface Mount Package / Case: 20-SSOP (0.209", 5.30mm Width) Supplier Device Package: 20-SSOP Base Part Number: PCM1718	1000 Order	1+: $0
PCM69AU-K-ND	PCM69AU-K	Texas Instruments	View more Packaging: Tube Part Status: Obsolete Type: DAC, Audio Number of Channels: 2 Resolution (Bits): 18 b Data Interface: PCM Voltage Supply Source: Analog and Digital Voltage - Supply: 5V Operating Temperature: -25C ~ 85C Mounting Type: Surface Mount Package / Case: 20-SOIC (0.295", 7.50mm Width) Supplier Device Package: 20-SOIC Base Part Number: PCM69	1000 Order	1+: $0
974-1069-2-ND	AK5720VT	AKM Semiconductor Inc.	View more Packaging: Tape & Reel (TR) Part Status: Active Type: ADC, Audio Number of Channels: 2 Resolution (Bits): 24 b Sampling Rate (Per Second): 96k Data Interface: IS Voltage Supply Source: Analog and Digital Voltage - Supply: 2.7 V ~ 5.5 V Operating Temperature: -40C ~ 105C Mounting Type: Surface Mount Package / Case: 16-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 16-TSSOP	1000 Order	--
AD1866RZ-REELTR -ND	AD1866RZ-REEL	Analog Devices Inc.	View more Packaging: Tape & Reel (TR) Part Status: Active Type: DAC, Audio Number of Channels: 2 Resolution (Bits): 16 b Data Interface: Serial Voltage Supply Source: Analog and Digital Voltage - Supply: 3.5 V ~ 5.25 V Operating Temperature: -35C ~ 85C Mounting Type: Surface Mount Package / Case: 16-SOIC (0.295", 7.50mm Width) Supplier Device Package: 16-SOIC Base Part Number: AD1866	127 Order	1+: $24.62
PCM1719E-ND	PCM1719E	Texas Instruments	View more Series: SoundPlus Packaging: Tube Part Status: Obsolete Type: DAC, Audio Number of Channels: 3 Resolution (Bits): 18 b Sampling Rate (Per Second): 48k Data Interface: IS Voltage Supply Source: Analog and Digital Voltage - Supply: 5V Operating Temperature: -25C ~ 85C Mounting Type: Surface Mount Package / Case: 28-SSOP (0.209", 5.30mm Width) Supplier Device Package: 28-SSOP Base Part Number: PCM1719	1000 Order	--
TLV320DAC23IPWG 4-ND	TLV320DAC23IPWG 4	Texas Instruments	View more Packaging: Tube Part Status: Active Type: DAC, Audio Number of Channels: 2 Resolution (Bits): 24 b Sampling Rate (Per Second): 8k ~ 96k Data Interface: IS, SPI Voltage Supply Source: Analog and Digital Voltage - Supply: 1.5V, 3.3V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 28-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 28-TSSOP Base Part Number: TLV320DAC23	1000 Order	100+: $3.0311
PCM1717E-ND	PCM1717E	Texas Instruments	View more Series: SoundPlus Packaging: Tube Part Status: Obsolete Type: DAC, Audio Number of Channels: 3 Resolution (Bits): 18 b Sampling Rate (Per Second): 48k Data Interface: IS Voltage Supply Source: Analog and Digital Voltage - Supply: 2.7 V ~ 5.5 V Operating Temperature: -25C ~ 85C Mounting Type: Surface Mount Package / Case: 20-SSOP (0.209", 5.30mm Width) Supplier Device Package: 20-SSOP Base Part Number: PCM1717	1000 Order	--
568-3442-5-ND	UDA1330ATS/N2,1 12	NXP USA Inc	View more Packaging: Tube Part Status: Obsolete Type: DAC, Audio Number of Channels: 3 Resolution (Bits): 20 b Sampling Rate (Per Second): 55k Data Interface: IS Voltage Supply Source: Analog and Digital Voltage - Supply: 2.7 V ~ 5.5 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 16-LSSOP (0.173", 4.40mm Width) Supplier Device Package: 16-SSOP Base Part Number: UDA1330	1000 Order	1+: $0
AD1953YSTZRL7-N D	AD1953YSTZRL7	Analog Devices Inc.	View more Series: SigmaDSP Packaging: Tape & Reel (TR) Part Status: Obsolete Type: DAC, Audio Number of Channels: 3 Resolution (Bits): 26 b Sampling Rate (Per Second): 48k Data Interface: DSD, PCM Voltage Supply Source: Analog and Digital Voltage - Supply: 5V Operating Temperature: -40C ~ 105C Mounting Type: Surface Mount Package / Case: 48-LQFP Supplier Device Package: 48-LQFP (7x7) Base Part Number: AD1953	1000 Order	1+: $0
296-18511-5-ND	PCM1798DB	Texas Instruments	View more Packaging: Tube Part Status: Active Type: DAC, Audio Number of Channels: 2 Resolution (Bits): 24 b Sampling Rate (Per Second): 200k Data Interface: PCM Voltage Supply Source: Analog and Digital Voltage - Supply: 3 V ~ 3.6 V, 5V Operating Temperature: -25C ~ 85C Mounting Type: Surface Mount Package / Case: 28-SSOP (0.209", 5.30mm Width) Supplier Device Package: 28-SSOP Base Part Number: PCM1798	329 Order	1+: $4.4037 10+: $3.9753 100+: $3.2913 500+: $2.866 1000+: $2.4962
568-11912-2-ND	UDA1334ATS/N2,1 18	NXP USA Inc	View more Packaging: Tape & Reel (TR) Part Status: Last Time Buy Type: DAC, Audio Number of Channels: 2 Resolution (Bits): 24 b Sampling Rate (Per Second): 96k Data Interface: IS Voltage Supply Source: Analog and Digital Voltage - Supply: 2.4 V ~ 3.6 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 16-LSSOP (0.173", 4.40mm Width) Supplier Device Package: 16-SSOP Base Part Number: UDA1334	7500 Order	2500+: $0.3837 5000+: $0.3645
568-3444-5-ND	UDA1334BT/N2,11 2	NXP USA Inc	View more Packaging: Tube Part Status: Obsolete Type: DAC, Audio Number of Channels: 3 Resolution (Bits): 24 b Sampling Rate (Per Second): 100k Data Interface: IS Voltage Supply Source: Analog and Digital Voltage - Supply: 1.8 V ~ 3.6 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 16-SOIC (0.154", 3.90mm Width) Supplier Device Package: 16-SO Base Part Number: UDA1334	1000 Order	1+: $0
568-13611-1-ND	UDA1361TS/N1,11 8	NXP USA Inc	View more Packaging: Cut Tape (CT) Part Status: Last Time Buy Type: ADC, Audio Number of Channels: 2 Resolution (Bits): 24 b Sampling Rate (Per Second): 110k Data Interface: IS Voltage Supply Source: Analog and Digital Voltage - Supply: 2.4 V ~ 3.6 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 16-LSSOP (0.173", 4.40mm Width) Supplier Device Package: 16-SSOP	2464 Order	1+: $1.1466 10+: $1.0319 100+: $0.8293 500+: $0.6813 1000+: $0.5645
PCM69AU/2K-ND	PCM69AU/2K	Texas Instruments	View more Packaging: Tape & Reel (TR) Part Status: Obsolete Type: DAC, Audio Number of Channels: 2 Resolution (Bits): 18 b Data Interface: PCM Voltage Supply Source: Analog and Digital Voltage - Supply: 5V Operating Temperature: -25C ~ 85C Mounting Type: Surface Mount Package / Case: 20-SOIC (0.295", 7.50mm Width) Supplier Device Package: 20-SOIC Base Part Number: PCM69	1000 Order	--
296-15636-2-ND	TLV320DAC23RHDR	Texas Instruments	View more Packaging: Tape & Reel (TR) Part Status: Active Type: DAC, Audio Number of Channels: 2 Resolution (Bits): 24 b Sampling Rate (Per Second): 8k ~ 96k Data Interface: IS, SPI Voltage Supply Source: Analog and Digital Voltage - Supply: 1.5V, 3.3V Operating Temperature: -10C ~ 70C Mounting Type: Surface Mount Package / Case: 28-VFQFN Exposed Pad Supplier Device Package: 28-VQFN (5x5) Base Part Number: TLV320DAC23	1000 Order	--
TLV320DAC23RHDG 4-ND	TLV320DAC23RHDG 4	Texas Instruments	View more Packaging: Tube Part Status: Active Type: DAC, Audio Number of Channels: 2 Resolution (Bits): 24 b Sampling Rate (Per Second): 8k ~ 96k Data Interface: IS, SPI Voltage Supply Source: Analog and Digital Voltage - Supply: 1.5V, 3.3V Operating Temperature: -10C ~ 70C Mounting Type: Surface Mount Package / Case: 28-VFQFN Exposed Pad Supplier Device Package: 28-VQFN (5x5) Base Part Number: TLV320DAC23	1000 Order	146+: $3.0405
PCM1750UG4-ND	PCM1750UG4	Texas Instruments	View more Packaging: Tube Part Status: Obsolete Type: ADC, Audio Number of Channels: 2 Resolution (Bits): 18 b Data Interface: Serial Voltage Supply Source: Analog and Digital, Dual Voltage - Supply: 4.75 V ~ 5.25 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 28-SOIC (0.295", 7.50mm Width) Supplier Device Package: 28-SOIC Base Part Number: PCM1750	1000 Order	1+: $0
NAU8501YGTR-ND	NAU8501YG TR	Nuvoton Technology Corporation of America	View more Packaging: Tape & Reel (TR) Part Status: Active Type: ADC, Audio Number of Channels: 6 Resolution (Bits): 24 b Data Interface: Serial Voltage Supply Source: Analog and Digital Voltage - Supply: 1.7 V ~ 3.6 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 32-WFQFN Exposed Pad Supplier Device Package: 32-QFN (5x5)	1000 Order	4000+: $0.9563
AD1866RZ-ND	AD1866RZ	Analog Devices Inc.	View more Packaging: Tube Part Status: Active Type: DAC, Audio Number of Channels: 2 Resolution (Bits): 16 b Data Interface: Serial Voltage Supply Source: Analog and Digital Voltage - Supply: 3.5 V ~ 5.25 V Operating Temperature: -35C ~ 85C Mounting Type: Surface Mount Package / Case: 16-SOIC (0.295", 7.50mm Width) Supplier Device Package: 16-SOIC Base Part Number: AD1866	6 Order	--
AD1871YRSZ-ND	AD1871YRSZ	Analog Devices Inc.	View more Packaging: Tube Part Status: Active Type: ADC, Audio Number of Channels: 2 Resolution (Bits): 24 b Sampling Rate (Per Second): 96k Data Interface: SPI Voltage Supply Source: Analog and Digital Voltage - Supply: 2.7 V ~ 5.5 V, 4.5 V ~ 5.5 V Operating Temperature: -40C ~ 105C Mounting Type: Surface Mount Package / Case: 28-SSOP (0.209", 5.30mm Width) Supplier Device Package: 28-SSOP Base Part Number: AD1871	10 Order	--
974-1077-ND	AK4495EQ	AKM Semiconductor Inc.	View more Packaging: Tray Part Status: Active Type: DAC, Audio Number of Channels: 2 Resolution (Bits): 32 b Sampling Rate (Per Second): 768k Data Interface: DSD, IS Voltage Supply Source: Analog and Digital Voltage - Supply: 3 V ~ 3.6 V, 4.75 V ~ 7.2 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 44-LQFP Supplier Device Package: 44-LQFP (10x10)	2 Order	--
TLV320DAC23RHD- ND	TLV320DAC23RHD	Texas Instruments	View more Packaging: Tube Part Status: Active Type: DAC, Audio Number of Channels: 2 Resolution (Bits): 24 b Sampling Rate (Per Second): 8k ~ 96k Data Interface: IS, SPI Voltage Supply Source: Analog and Digital Voltage - Supply: 1.5V, 3.3V Operating Temperature: -10C ~ 70C Mounting Type: Surface Mount Package / Case: 28-VFQFN Exposed Pad Supplier Device Package: 28-VQFN (5x5) Base Part Number: TLV320DAC23	1000 Order	146+: $3.0405

< 1 2 3 4 5 >

Hot Searches: audio digital resistor digital variable resistor audio resistor output voltage audio digital rheostat resistor digital audio transmitter 5.5v digital audio 2.2v digital audio 6v digital audio 2.3v digital audio 4.8v digital audio digital audio ic transmitter digital audio transmitter ic digital ic audio 5.5v digital audio ic 2.2v digital audio ic 6v digital audio ic 2.3v digital audio ic 4.8v digital audio ic dit4096 digital audio workstation

Search Result:audio digital resistor

Related Categories