Datasheet AD7689-KGD (Analog Devices)

16-Bit, 8-Channel, 250 kSPS PulSAR ADC Known Good Die AD7689-KGD FEATURES FUNCTIONAL BLOCK DIAGRAM 16-bit resolution with no missing codes 0.5V TO VDD – 0.5V 0.5V TO VDD 2.3V TO 5.5V 0.1µF 10µF 8-channel multiplexer with choice of inputs Unipolar single-ended REFIN REF VDD Differential (GND sense) 1.8V Pseudobipolar BAND GAP TO VIO REF VDD AD7689-KGD Throughput: 250 kSPS TEMP INL: −2.5 LSB minimum, ±0.4 LSB typical, +2.5 LSB maximum SENSOR Dynamic range: 93.8 dB IN0 CNV IN1 SINAD: 91 dB typical at 20 kHz, V SCK REF = 5 V IN2 SPI SERIAL MUX 16-BIT SAR THD: −100 dB at 20 kHz IN3 ADC INTERFACE SDO IN4 Analog input range: 0 V to V IN5 ONE-POLE DIN REF with VREF up to VDD IN6 LPF Multiple reference types SEQUENCER IN7 Internal selectable 2.5 V or 4.096 V COM
005
External buffered (up to 4.096 V) GND
15658-
External (up to VDD)
Figure 1. Composite View
Internal temperature sensor (TEMP) Channel sequencer, selectable 1-pole filter, busy indicator GENERAL DESCRIPTION No pipeline delay, SAR architecture
The AD7689-KGD is a 8-channel, 16-bit, charge redistribution
Single-supply 2.3 V to 5.5 V operation with 1.8 V to 5.5 V
successive approximation register (SAR) analog-to-digital
logic interface
converter (ADC) that operates from a single power supply, VDD.
Serial interface compatible with SPI, MICROWIRE, QSPI, and DSP
The AD7689-KGD contains all components for use in a multi-
Power dissipation
channel, low power data acquisition system, including a true
3.5 mW at 2.5 V, 200 kSPS
16-bit SAR ADC with no missing codes; an 8-channel low
12.5 mW at 5 V, 250 kSPS
crosstalk multiplexer that is useful for configuring the inputs
Standby current: 50 nA
as single-ended (with or without ground sense), differential, or
Low cost grade available
bipolar; an internal low drift reference (selectable 2.5 V or 4.096 V)
Known Good Die (KGD): these die are fully guaranteed to
and buffer; a temperature sensor; a selectable one-pole filter;
data sheet specifications.
and a sequencer that is useful when channels are continuously scanned in order.
APPLICATIONS
The AD7689-KGD uses a simple SPI interface for writing to the
Multichannel system monitoring
configuration register and receiving conversion results. The SPI
Battery-powered equipment
interface uses a separate supply, VIO, which is set to the host
Medical instruments: ECG/EKG
logic level. Power dissipation scales with throughput.
Mobile communications: GPS Power line monitoring
The AD7689-KGD is specified from −40°C to +85°C.
Data acquisition
Additional application and technical information can be found
Seismic data acquisition systems
in the AD7689 data sheet.
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Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS OUTLINE DIMENSIONS DIE SPECIFICATIONS AND ASSEMBLY RECOMMENDATIONS ORDERING GUIDE