AD7820 Series

8-Bit, 2µS, Sampling A/D Converter

Catalog

8-Bit, 2µS, Sampling A/D Converter

Part	Number of Bits	Data Interface	Input Type	Reference Type	Mounting Type	Number of Inputs	Number of A/D Converters	Supplier Device Package	Architecture	Configuration	Voltage - Supply, Analog	Package / Case	Package / Case [y]	Package / Case [y]	Voltage - Supply, Digital	Operating Temperature [Max]	Operating Temperature [Min]	Ratio - S/H:ADC	Package / Case	Package / Case
Analog Devices AD7820KR	8	Parallel	Single Ended	External	Surface Mount	1	1	20-SOIC	Flash	S/H-ADC	5 V	20-SOIC	0.295 in	7.5 mm	5 V	85 °C	-40 °C	1:1
Analog Devices AD7820LPZ	8	Parallel	Single Ended	External	Surface Mount	1	1	20-PLCC (9x9)	Flash	S/H-ADC	5 V	20-LCC (J-Lead)			5 V	85 °C	-40 °C	1:1
Analog Devices AD7820LNZ	8	Parallel	Single Ended	External	Through Hole	1	1	20-PDIP	Flash	S/H-ADC	5 V	20-DIP			5 V	85 °C	-40 °C	1:1	7.62 mm	0.3 in
Analog Devices AD7820KPZ-REEL	8	Parallel	Single Ended	External	Surface Mount	1	1	20-PLCC (9x9)	Flash	S/H-ADC	5 V	20-LCC (J-Lead)			5 V	85 °C	-40 °C	1:1
Analog Devices AD7820KNZ	8	Parallel	Single Ended	External	Through Hole	1	1	20-PDIP	Flash	S/H-ADC	5 V	20-DIP			5 V	85 °C	-40 °C	1:1	7.62 mm	0.3 in
Analog Devices AD7820LR	8				Surface Mount			20-SOIC				20-SOIC	0.295 in	7.5 mm		85 °C	-40 °C
Analog Devices AD7820TQ	8	Parallel	Single Ended	External	Through Hole	1	1	20-CERDIP	Flash	S/H-ADC	5 V	20-CDIP			5 V	125 °C	-55 °C	1:1
Analog Devices AD7820LRZ	8	Parallel	Single Ended	External	Surface Mount	1	1	20-SOIC	Flash	S/H-ADC	5 V	20-SOIC	0.295 in	7.5 mm	5 V	85 °C	-40 °C	1:1
Analog Devices AD7820CQ	8	Parallel	Single Ended	External	Through Hole	1	1	20-CERDIP	Flash	S/H-ADC	5 V	20-CDIP			5 V	85 °C	-40 °C	1:1
Analog Devices AD7820KP-REEL	8	Parallel	Single Ended	External	Surface Mount	1	1	20-PLCC (9x9)	Flash	S/H-ADC	5 V	20-LCC (J-Lead)			5 V	85 °C	-40 °C	1:1

Catalog

8-Bit, 2µS, Sampling A/D Converter

Key Features

• Fast Conversion Time: 1.36 µs max

• Built-In Track-and-Hold Function

• No Missed Codes

• No User Trims Required

• Single +5V Supply

• Ratiometric Operation

• No External Clock

• Extended Temperature Range Operation

• Skinny 20-Pin DIP, SOIC and 20-Terminal Surface Mount Packages

Description

The AD7820 is a high speed, microprocessor-compatible 8-bit ADC which uses a half-flash conversion technique to achieve a conversion time of 1.36 µs. The converter has a 0 V to +5 V analog input voltage range with a single +5 V supply.The half-flash technique consists of 31 comparators, a most significant 4-bit ADC and a least significant 4-bit ADC. The input to the AD7820 is tracked and held by the input sampling circuitry, eliminating the need for an external sample-and-hold for signals with slew rates less than 100 mV/µs.The part is designed for ease of microprocessor interface with the AD7820 appearing as a memory location or I/O port without the need for external interfacing logic. All digital outputs use latched, three-state output buffer circuitry to allow direct connection to a microprocessor data bus or system input port. A non-three state overflow output is also provided to allow cascading of devices to give higher resolution.