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Data Sheet

AD7609

GENERAL DESCRIPTION

The AD7609 is an 18-bit, 8-channel, true differential,

simultaneous sampling analog-to-digital data acquisition

system (DAS). The part contains analog input clamp protection,

a second-order antialiasing filter, a track-and-hold amplifier, an

18-bit charge redistribution successive approximation analog-

to-digital converter (ADC), a flexible digital filter, a 2.5 V

reference and reference buffer, and high speed serial and

parallel interfaces.

The AD7609 operates from a single 5 V supply and can

accommodate ±10 V and ±5 V true bipolar differential input

signals while sampling at throughput rates up to 200 kSPS for

all channels. The input clamp protection circuitry can tolerate

voltages up to ±16.5 V. The AD7609 has 1 MΩ analog input

impedance regardless of sampling frequency. The single supply

operation, on-chip filtering, and high input impedance elimi-

nate the need for driver op amps and external bipolar supplies.

The AD7609 antialiasing filter has a −3 dB cutoff frequency of

32 kHz and provides 40 dB antialias rejection when sampling

at 200 kSPS. The flexible digital filter is pin driven, yields

improvements in SNR, and reduces the −3 dB bandwidth.

Rev. B | Page 3 of 36

Manufacturer	Part #	Datasheet	Description
Analog Devices	CED1Z	799Kb / 36P	8-/6-/4-Channel DAS with 16-Bit,Bipolar Input,Simultaneous Sampling ADC REV. 0
	CED1Z	799Kb / 36P	8-Channel Differential DAS with 18-Bit REV. A
	CED1Z	681Kb / 32P	8-Channel DAS with 14-Bit, Bipolar Input, Simultaneous Sampling ADC REV. B
	CED1Z	725Kb / 33P	8-Channel DAS with 18-Bit, Bipolar, Simultaneous Sampling ADC

Manufacturer	Part #	Datasheet	Description
Analog Devices	AD7609	799Kb / 36P	8-Channel Differential DAS with 18-Bit REV. A
	AD7609	799Kb / 36P	8-Channel Differential DAS with 18-Bit, Bipolar, Simultaneous Sampling ADC REV. A
	AD7581	501Kb / 8P	CMOS P Compatible 8 Bit 8 Channel DAS REV. A
	AD7581	504Kb / 8P	CMOS uP-COMPATIBLE 8-BIT, 8-CHANNEL DAS REV. A
	AD7606B	1Mb / 69P	8-Channel DAS Bipolar Input, Simultaneous Sampling ADC
	AD7608	689Kb / 32P	8-Channel DAS with 18-Bit, Bipolar, Simultaneous Sampling ADC REV. A
	AD7608	725Kb / 33P	8-Channel DAS with 18-Bit, Bipolar, Simultaneous Sampling ADC
	AD4858	2Mb / 70P	Buffered, 8-Channel Simultaneous Sampling, 20-Bit 1 MSPS DAS Rev. 0
	AD7607	779Kb / 33P	8-Channel DAS with 14-Bit, Bipolar Input, Simultaneous Sampling ADC
	AD7608BSTZ	689Kb / 32P	8-Channel DAS with 18-Bit, Bipolar, Simultaneous Sampling ADC REV. A

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