Dialog operational amplifier - Allicdata Electronics

Related Categories

1 2 3 4 5 >

Allicdata Part#	Mft.Part#	Company	Spec.	QTY.	Pricing(USD)
1564-1060-ND	DA7202-EVAL	Dialog Semiconductor GmbH	View more Part Status: Active Amplifier Type: Class D Output Type: 1-Channel (Mono) Max Output Power x Channels @ Load: 10W x 1 @ 4 Ohm Voltage - Supply: 1.3 V ~ 5.5 V Board Type: Fully Populated Utilized IC / Part: DA7202 Supplied Contents: Board(s)	2 Order	1+: $20.2797
DA7202-00UH2-ND	DA7202-00UH2	Dialog Semiconductor GmbH	View more Part Status: Active Type: Class D Output Type: 1-Channel (Mono) Max Output Power x Channels @ Load: 10W x 1 @ 4 Ohm Voltage - Supply: 4.5 V ~ 9 V Features: Depop, Short-Circuit and Thermal Protection Operating Temperature: -40C ~ 85C (TA)	1000 Order	4000+: $0.318
DA7211-01UA2-ND	DA7211-01UA2	Dialog Semiconductor GmbH	View more Part Status: Active Type: Stereo Audio Data Interface: IS, PCM Number of ADCs / DACs: 2 / 2 Sigma Delta: Yes S/N Ratio, ADCs / DACs (db) Typ: 96 / 100 Voltage - Supply, Analog: 1.8 V ~ 2.5 V Voltage - Supply, Digital: 1.2 V ~ 2.5 V Operating Temperature: -40C ~ 85C	1000 Order	--
DA7210-00UC2-ND	DA7210-00UC2	Dialog Semiconductor GmbH	View more Part Status: Not For New Designs Type: Audio Data Interface: IS, PCM Resolution (Bits): 24 b Number of ADCs / DACs: 2 / 2 Sigma Delta: Yes S/N Ratio, ADCs / DACs (db) Typ: 96 / 100 Voltage - Supply, Analog: 1.8 V ~ 2.5 V Voltage - Supply, Digital: 1.2 V ~ 2.5 V Operating Temperature: -40C ~ 85C	1000 Order	2000+: $0.5869
DA7211-01UA6-ND	DA7211-01UA6	Dialog Semiconductor GmbH	View more Part Status: Active Type: Stereo Audio Data Interface: IS, PCM Number of ADCs / DACs: 2 / 2 Sigma Delta: Yes S/N Ratio, ADCs / DACs (db) Typ: 96 / 100 Voltage - Supply, Analog: 1.8 V ~ 2.5 V Voltage - Supply, Digital: 1.2 V ~ 2.5 V Operating Temperature: -40C ~ 85C	1000 Order	900+: $0.7268
DA7210-00UC6-ND	DA7210-00UC6	Dialog Semiconductor GmbH	View more Part Status: Not For New Designs Type: Audio Data Interface: IS, PCM Resolution (Bits): 24 b Number of ADCs / DACs: 2 / 2 Sigma Delta: Yes S/N Ratio, ADCs / DACs (db) Typ: 96 / 100 Voltage - Supply, Analog: 1.8 V ~ 2.5 V Voltage - Supply, Digital: 1.2 V ~ 2.5 V Operating Temperature: -40C ~ 85C	1000 Order	900+: $0.7608
1564-1025-ND	SC14CVMDECT SF0 2T	Dialog Semiconductor GmbH	View more Packaging: Tray Part Status: Active RF Family/Standard: General ISM > 1GHZ Frequency: 1.9GHz Antenna Type: Integrated, Chip Voltage - Supply: 3.3V Current - Receiving: 10mA Current - Transmitting: 47mA Mounting Type: Surface Mount Package / Case: Module	1192 Order	--
1564-1046-2-ND	DA14585-00000VV 2	Dialog Semiconductor GmbH	View more Series: SmartBond Packaging: Tape & Reel (TR) Part Status: Active Type: TxRx + MCU RF Family/Standard: Bluetooth Protocol: Bluetooth v5.0 Frequency: 2.4GHz Power - Output: 0dBm Sensitivity: -93dBm Memory Size: 64kB OTP, 128kB ROM, 96kB SRAM Serial Interfaces: IC, SPI, UART GPIO: 14 Voltage - Supply: 3.3V Current - Receiving: 3.7mA Current - Transmitting: 3.4mA Package / Case: 34-XFBGA, WLCSP	7500 Order	7500+: $0.8103
1564-1036-2-ND	DA14681-01000A9 2	Dialog Semiconductor GmbH	View more Series: SmartBond Packaging: Tape & Reel (TR) Part Status: Active Type: TxRx + MCU RF Family/Standard: Bluetooth Protocol: Bluetooth v4.2 Frequency: 2.4GHz Power - Output: 0dBm Sensitivity: -94dBm Memory Size: 64kB OTP, 128kB ROM, 144kB SRAM Serial Interfaces: IC, IS, PCM, SPI, UART, USB Voltage - Supply: 1.7 V ~ 4.5 V Package / Case: 60-VFQFN	4000 Order	4000+: $1.4615
1564-1034-2-ND	DA14680-01F08A9 2	Dialog Semiconductor GmbH	View more Series: SmartBond Packaging: Tape & Reel (TR) Part Status: Active Type: TxRx + MCU RF Family/Standard: Bluetooth Protocol: Bluetooth v4.2 Frequency: 2.4GHz Power - Output: 0dBm Sensitivity: -94dBm Memory Size: 8Mb Flash, 64kB OTP, 128kB ROM, 144kB SRAM Serial Interfaces: IC, IS, PCM, SPI, UART, USB Voltage - Supply: 1.7 V ~ 4.5 V Package / Case: 60-VFQFN	4000 Order	4000+: $1.9315
1564-1026-ND	SC14WAMDECT SF0 1	Dialog Semiconductor GmbH	View more Packaging: Tray Part Status: Active RF Family/Standard: General ISM > 1GHZ Frequency: 1.9GHz Power - Output: 20dBm Sensitivity: -93dBm Serial Interfaces: UART Antenna Type: Integrated, Chip Voltage - Supply: 3.4V Current - Receiving: 85mA Current - Transmitting: 200mA Mounting Type: Surface Mount Operating Temperature: -40C ~ 85C Package / Case: 88-SMD Module	432 Order	1+: $21.9303 10+: $20.2249 100+: $17.2706
1564-1047-2-ND	DA14585-00000AT 2	Dialog Semiconductor GmbH	View more Series: SmartBond Packaging: Tape & Reel (TR) Part Status: Active Type: TxRx + MCU RF Family/Standard: Bluetooth Protocol: Bluetooth v5.0 Frequency: 2.4GHz Power - Output: 0dBm Sensitivity: -93dBm Memory Size: 64kB OTP, 128kB ROM, 96kB SRAM Serial Interfaces: IC, SPI, UART GPIO: 25 Voltage - Supply: 3.3V Current - Receiving: 3.7mA Current - Transmitting: 3.4mA Package / Case: 40-VFQFN Exposed Pad	1000 Order	5000+: $0.9094
1564-1035-2-ND	DA14681-01000U2 2	Dialog Semiconductor GmbH	View more Series: SmartBond Packaging: Tape & Reel (TR) Part Status: Active Type: TxRx + MCU RF Family/Standard: Bluetooth Protocol: Bluetooth v4.2 Frequency: 2.4GHz Power - Output: 0dBm Sensitivity: -94dBm Memory Size: 64kB OTP, 128kB ROM, 144kB SRAM Serial Interfaces: IC, IS, PCM, SPI, UART, USB Voltage - Supply: 1.7 V ~ 4.5 V Package / Case: 53-BGA, WLCSP	1000 Order	5000+: $1.2536
DA14581-00000VR A-ND	DA14581-00000VR A	Dialog Semiconductor GmbH	View more Part Status: Active Type: TxRx + MCU RF Family/Standard: Bluetooth Protocol: Bluetooth v4.1 Frequency: 2.4GHz Power - Output: -1dBm Sensitivity: -93dBm Memory Size: 32kB OTP, 84kB ROM, 50kB SRAM Serial Interfaces: IC, SPI, UART GPIO: 24 Voltage - Supply: 2.35 V ~ 3.3 V Current - Receiving: 3.7mA Current - Transmitting: 3.4mA Operating Temperature: -40C ~ 85C	1000 Order	5000+: $0.7769
DA14580-01AT1-N D	DA14580-01AT1	Dialog Semiconductor GmbH	View more Part Status: Active Type: TxRx + MCU RF Family/Standard: Bluetooth Protocol: Bluetooth v4.2 Frequency: 2.4GHz Power - Output: 0dBm Sensitivity: -93dBm Memory Size: 32kB OTP, 84kB ROM, 50kB SRAM Serial Interfaces: IC, SPI, UART GPIO: 32 Voltage - Supply: 3.3V Current - Receiving: 3.7mA Current - Transmitting: 3.4mA Operating Temperature: -40C ~ 85C	1000 Order	250+: $1.3077
DA14581-00AT1-N D	DA14581-00AT1	Dialog Semiconductor GmbH	View more Part Status: Active Type: TxRx + MCU RF Family/Standard: Bluetooth Protocol: Bluetooth v4.1 Frequency: 2.4GHz Power - Output: -1dBm Sensitivity: -93dBm Memory Size: 32kB OTP, 84kB ROM, 50kB SRAM Serial Interfaces: IC, SPI, UART GPIO: 24 Voltage - Supply: 2.35 V ~ 3.3 V Current - Receiving: 3.7mA Current - Transmitting: 3.4mA Operating Temperature: -40C ~ 85C	1000 Order	250+: $1.3077
DA14582-01KA2-N D	DA14582-01KA2	Dialog Semiconductor GmbH	View more Part Status: Active Type: TxRx + MCU RF Family/Standard: Bluetooth Protocol: Bluetooth v4.2 Frequency: 2.4GHz Power - Output: 0dBm Sensitivity: -93dBm Memory Size: 32kB OTP, 84kB ROM, 50kB SRAM Serial Interfaces: IC, SPI, UART GPIO: 29 Voltage - Supply: 1.8V Current - Receiving: 3.7mA Current - Transmitting: 3.4mA Operating Temperature: -20C ~ 60C	1000 Order	4000+: $1.3333
SC14CVMDECTSF01 T-ND	SC14CVMDECT SF0 1T	Dialog Semiconductor GmbH	View more Part Status: Not For New Designs Frequency: 1.88GHz ~ 1.9GHz Power - Output: 23dBm Sensitivity: -93dBm Serial Interfaces: UART Antenna Type: Integrated, Trace Voltage - Supply: 3.3V Mounting Type: Surface Mount Operating Temperature: -40C ~ 85C	1000 Order	600+: $7.1432
DA14580-01A31-N D	DA14580-01A31	Dialog Semiconductor GmbH	View more Part Status: Active Type: TxRx + MCU RF Family/Standard: Bluetooth Protocol: Bluetooth v4.2 Frequency: 2.4GHz Power - Output: 0dBm Sensitivity: -93dBm Memory Size: 32kB OTP, 84kB ROM, 50kB SRAM Serial Interfaces: IC, SPI, UART GPIO: 32 Voltage - Supply: 3.3V Current - Receiving: 3.7mA Current - Transmitting: 3.4mA Operating Temperature: -40C ~ 85C	1000 Order	250+: $1.4741
DA14583-01F01AT 1-ND	DA14583-01F01AT 1	Dialog Semiconductor GmbH	View more Part Status: Active Type: TxRx + MCU RF Family/Standard: Bluetooth Protocol: Bluetooth v4.1 Frequency: 2.4GHz Power - Output: -1dBm Sensitivity: -93dBm Memory Size: 1Mb Flash, 32kB OTP, 84kB ROM, 50kB SRAM Serial Interfaces: IC, SPI, UART GPIO: 24 Voltage - Supply: 2.35 V ~ 3.3 V Current - Receiving: 3.7mA Current - Transmitting: 3.4mA Operating Temperature: -40C ~ 85C	1000 Order	200+: $1.8311
IW1816-20-SO7-N D	IW1816-20-SO7	Dialog Semiconductor GmbH	View more Part Status: Active Output Isolation: Isolated Internal Switch(s): Yes Voltage - Breakdown: 800V Topology: Flyback Voltage - Start Up: 11V Voltage - Supply (Vcc/Vdd): 4 V ~ 16 V Frequency - Switching: 64kHz Power (Watts): 5W Fault Protection: Over Temperature, Over Voltage, Short Circuit Operating Temperature: -40C ~ 85C (TA)	1000 Order	2500+: $0.1957
IW1830-01-ND	IW1830-01	Dialog Semiconductor GmbH	View more Part Status: Active Output Isolation: Isolated Internal Switch(s): Yes Voltage - Breakdown: 700V Topology: Flyback Voltage - Supply (Vcc/Vdd): 85 V ~ 264 V Frequency - Switching: 79kHz Power (Watts): 15W Fault Protection: Over Temperature, Over Voltage, Short Circuit Operating Temperature: -40C ~ 150C (TJ)	1000 Order	1000+: $0.3374
1564-1029-ND	IW1818-00	Dialog Semiconductor GmbH	View more Packaging: Tube Part Status: Active Output Isolation: Isolated Internal Switch(s): Yes Voltage - Breakdown: 800V Topology: Flyback Voltage - Supply (Vcc/Vdd): 85 V ~ 264 V Frequency - Switching: 72kHz Power (Watts): 10W Fault Protection: Over Temperature Operating Temperature: 150C (TJ) Package / Case: 8-DIP (0.300", 7.62mm), 7 Leads Supplier Device Package: 7-PDIP Mounting Type: Through Hole	903 Order	1+: $0.5607 10+: $0.4983 25+: $0.4498 100+: $0.3936 250+: $0.3454 500+: $0.3052 1000+: $0.241 2500+: $0.2249 5000+: $0.2137
1564-1044-2-ND	DA7218-00U32	Dialog Semiconductor GmbH	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Audio Data Interface: IC, IS Resolution (Bits): 24 b Number of ADCs / DACs: 2 / 2 Sigma Delta: No S/N Ratio, ADCs / DACs (db) Typ: 90 / 100 Dynamic Range, ADCs / DACs (db) Typ: 105 / 110 Voltage - Supply, Analog: 1.7 V ~ 2.65 V Voltage - Supply, Digital: 1.5 V ~ 3.6 V Operating Temperature: -25C ~ 85C Mounting Type: Surface Mount Package / Case: 34-UFBGA, WLCSP Supplier Device Package: 34-WLCSP (4.57x1.98)	1000 Order	7500+: $0.6098
1564-1055-ND	DA7219-02VB6	Dialog Semiconductor GmbH	View more Packaging: Tray Part Status: Active Type: Audio Data Interface: IC Resolution (Bits): 24 b Number of ADCs / DACs: 1 / 2 S/N Ratio, ADCs / DACs (db) Typ: 90 / 100 Voltage - Supply, Digital: 1.7 V ~ 3.6 V Operating Temperature: -25C ~ 85C Mounting Type: Surface Mount Package / Case: 32-UFBGA, WLCSP Supplier Device Package: 32-WLCSP (4.5x1.64)	1000 Order	2450+: $0.5607
1564-1048-2-ND	DA14586-00F02AT 2	Dialog Semiconductor GmbH	View more Series: SmartBond Packaging: Tape & Reel (TR) Part Status: Active Type: TxRx + MCU RF Family/Standard: Bluetooth Protocol: Bluetooth v5.0 Frequency: 2.4GHz Power - Output: 0dBm Sensitivity: -93dBm Memory Size: 2Mb Flash, 64kB OTP, 128kB ROM, 96kB SRAM Serial Interfaces: IC, SPI, UART GPIO: 24 Voltage - Supply: 3.3V Current - Receiving: 3.7mA Current - Transmitting: 3.4mA Package / Case: 40-VFQFN Exposed Pad	5000 Order	5000+: $1.1634
1564-1015-2-ND	DA14581-00UNA	Dialog Semiconductor GmbH	View more Packaging: Tape & Reel (TR) Part Status: Active Type: TxRx + MCU RF Family/Standard: Bluetooth Protocol: Bluetooth v4.1 Frequency: 2.4GHz Power - Output: -1dBm Sensitivity: -93dBm Memory Size: 32kB OTP, 84kB ROM, 50kB SRAM Serial Interfaces: IC, SPI, UART GPIO: 14 Voltage - Supply: 2.35 V ~ 3.3 V Current - Receiving: 3.7mA Current - Transmitting: 3.4mA Operating Temperature: -40C ~ 85C Package / Case: 34-UFBGA, WLCSP	5000 Order	5000+: $0.7853
1564-1012-2-ND	DA14580-01UNA	Dialog Semiconductor GmbH	View more Packaging: Tape & Reel (TR) Part Status: Active Type: TxRx + MCU RF Family/Standard: Bluetooth Protocol: Bluetooth v4.1 Frequency: 2.4GHz Power - Output: -1dBm Sensitivity: -93dBm Memory Size: 32kB OTP, 84kB ROM, 50kB SRAM Serial Interfaces: IC, SPI, UART GPIO: 14 Voltage - Supply: 2.35 V ~ 3.3 V Current - Receiving: 3.7mA Current - Transmitting: 3.4mA Operating Temperature: -40C ~ 85C Package / Case: 34-UFBGA, WLCSP	1000 Order	5000+: $0.7853
1564-1016-2-ND	DA14581-00AT2	Dialog Semiconductor GmbH	View more Packaging: Tape & Reel (TR) Part Status: Active Type: TxRx + MCU RF Family/Standard: Bluetooth Protocol: Bluetooth v4.1 Frequency: 2.4GHz Power - Output: -1dBm Sensitivity: -93dBm Memory Size: 32kB OTP, 84kB ROM, 50kB SRAM Serial Interfaces: IC, SPI, UART GPIO: 24 Voltage - Supply: 2.35 V ~ 3.3 V Current - Receiving: 3.7mA Current - Transmitting: 3.4mA Operating Temperature: -40C ~ 85C Package / Case: 40-VFQFN Exposed Pad	1000 Order	5000+: $0.9013
1564-1014-2-ND	DA14580-01A32	Dialog Semiconductor GmbH	View more Packaging: Tape & Reel (TR) Part Status: Active Type: TxRx + MCU RF Family/Standard: Bluetooth Protocol: Bluetooth v4.1 Frequency: 2.4GHz Power - Output: -1dBm Sensitivity: -93dBm Memory Size: 32kB OTP, 84kB ROM, 50kB SRAM Serial Interfaces: IC, SPI, UART GPIO: 32 Voltage - Supply: 2.35 V ~ 3.3 V Current - Receiving: 3.7mA Current - Transmitting: 3.4mA Operating Temperature: -40C ~ 85C Package / Case: 48-VFQFN Exposed Pad	1000 Order	4000+: $1.0598
1564-1017-2-ND	DA14583-01F01AT 2	Dialog Semiconductor GmbH	View more Packaging: Tape & Reel (TR) Part Status: Active Type: TxRx + MCU RF Family/Standard: Bluetooth Protocol: Bluetooth v4.1 Frequency: 2.4GHz Power - Output: -1dBm Sensitivity: -93dBm Memory Size: 1Mb Flash, 32kB OTP, 84kB ROM, 50kB SRAM Serial Interfaces: IC, SPI, UART GPIO: 24 Voltage - Supply: 2.35 V ~ 3.3 V Current - Receiving: 3.7mA Current - Transmitting: 3.4mA Operating Temperature: -40C ~ 85C Package / Case: 40-VFQFN Exposed Pad	1000 Order	5000+: $1.1389
1564-1013-2-ND	DA14580-01AT2	Dialog Semiconductor GmbH	View more Packaging: Tape & Reel (TR) Part Status: Active Type: TxRx + MCU RF Family/Standard: Bluetooth Protocol: Bluetooth v4.1 Frequency: 2.4GHz Power - Output: -1dBm Sensitivity: -93dBm Memory Size: 32kB OTP, 84kB ROM, 50kB SRAM Serial Interfaces: IC, SPI, UART GPIO: 24 Voltage - Supply: 2.35 V ~ 3.3 V Current - Receiving: 3.7mA Current - Transmitting: 3.4mA Operating Temperature: -40C ~ 85C Package / Case: 40-VFQFN Exposed Pad	1000 Order	5000+: $0.9013
1564-1030-ND	IW1830-00	Dialog Semiconductor GmbH	View more Packaging: Tube Part Status: Active Output Isolation: Isolated Internal Switch(s): Yes Voltage - Breakdown: 700V Topology: Flyback Voltage - Supply (Vcc/Vdd): 85 V ~ 264 V Frequency - Switching: 79kHz Power (Watts): 15W Fault Protection: Over Temperature, Over Voltage, Short Circuit Operating Temperature: -40C ~ 150C (TJ) Package / Case: 8-DIP (0.300", 7.62mm), 7 Leads Supplier Device Package: 7-PDIP Mounting Type: Through Hole	769 Order	1+: $0.7875 10+: $0.6974 25+: $0.6297 100+: $0.5511 250+: $0.4836 500+: $0.4273 1000+: $0.3374 2500+: $0.3149 5000+: $0.2991
1564-1020-2-ND	DA7212-01UM2	Dialog Semiconductor GmbH	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Audio Number of ADCs / DACs: 2 / 2 Sigma Delta: Yes S/N Ratio, ADCs / DACs (db) Typ: 90 / 100 Voltage - Supply, Analog: 1.7 V ~ 2.5 V Voltage - Supply, Digital: 1.6 V ~ 3.6 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 34-UFBGA, CSPBGA Supplier Device Package: 34-CSP (4.5x1.66)	4500 Order	--
1564-1054-2-ND	DA7219-02VBA	Dialog Semiconductor GmbH	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Audio Data Interface: IC Resolution (Bits): 24 b Number of ADCs / DACs: 1 / 2 S/N Ratio, ADCs / DACs (db) Typ: 90 / 100 Voltage - Supply, Digital: 1.7 V ~ 3.6 V Operating Temperature: -25C ~ 85C Mounting Type: Surface Mount Package / Case: 32-UFBGA, WLCSP Supplier Device Package: 32-WLCSP (4.5x1.64)	1000 Order	--
1564-1043-2-ND	DA7217-00U32	Dialog Semiconductor GmbH	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Audio Data Interface: IC, IS Resolution (Bits): 24 b Number of ADCs / DACs: 2 / 2 Sigma Delta: No S/N Ratio, ADCs / DACs (db) Typ: 90 / 100 Dynamic Range, ADCs / DACs (db) Typ: 105 / 110 Voltage - Supply, Analog: 1.7 V ~ 2.65 V Voltage - Supply, Digital: 1.5 V ~ 3.6 V Operating Temperature: -25C ~ 85C Mounting Type: Surface Mount Package / Case: 34-UFBGA, WLCSP Supplier Device Package: 34-WLCSP (4.57x1.98)	1000 Order	--
1564-1056-ND	DA14681-01DKWEA R	Dialog Semiconductor GmbH	View more Series: SmartBond Part Status: Active Lead Free Status / RoHS Status: Not applicable / Not applicable Main Purpose: Kit Type: Starter Pack	51 Order	1+: $161.412
1564-1021-ND	ARD-AUDIO-DA721 2	Dialog Semiconductor GmbH	View more Part Status: Active Platform: Arduino Type: Audio Function: CODEC Utilized IC / Part: DA7212 Contents: Board(s)	55 Order	1+: $20.2797
1564-1069-ND	DA14585IOTMSENS OR	Dialog Semiconductor GmbH	View more Series: SmartBond Part Status: Active Type: Transceiver; Bluetooth 5 Frequency: 2.4GHz For Use With/Related Products: DA14585 Supplied Contents: Board(s)	20 Order	1+: $39.7467
1564-1009-ND	DA14581DEVKT-B	Dialog Semiconductor GmbH	View more Series: SmartBond Part Status: Obsolete Type: Transceiver; Bluetooth Smart 4.x Low Energy (BLE) Frequency: 2.4GHz For Use With/Related Products: DA14581 Supplied Contents: Board(s)	1000 Order	1+: $0

1 2 3 4 5 >

Hot Searches: dialog operational amplifier dialog buffer amplifier ablic operational amplifier advanced operational amplifier arms operational amplifier analog operational amplifier akm operational amplifier broadcom operational amplifier electric operational amplifier cirrus operational amplifier diode operational amplifier honeywell operational amplifier ixys operational amplifier maxlinear operational amplifier monolithic operational amplifier njrc operational amplifier nxp operational amplifier anselmi operational amplifier panasonic operational amplifier parallax operational amplifier

Search Result:dialog operational amplifier

Related Categories