ANALOG DEVICES AD7699 Service Manual
16-Bit, 8-Channel,
AD7699
AD7699
REF
GND
VDD
VIO
DIN
SCK
SDO
CNV
1.8V
TO
VDD
5V
SEQUENCER
SPI SERIAL
INTERFACE
MUX
16-BIT SAR
ADC
BAND GAP
REF
TEMP
SENSOR
REFIN
IN0
IN1
IN4
IN5
IN6
IN7
IN3
IN2
COM
0.5V TO V DD
10µF
ONE-POLE
LPF
0.5V TO 4.096V
0.1µF
07354-001
www.BDTIC.com/ADI
500 kSPS PulSAR ADC
FEATURES
16-bit resolution with no missing codes
8-channel multiplexer with choice of inputs
Unipolar single-ended
Differential (GND sense)
Pseudobipolar
Throughput: 500 kSPS
INL: ±0.5 LSB typical, ±1.5 LSB maximum (±23 ppm or FSR)
Dynamic range: 93.3 dB
SINAD: 91.5 dB @ 20 kHz
THD: −97 dB @ 20 kHz
Analog input range: 0 V to V
Multiple reference types
Internal 4.096 V
External buffered (up to 4.096 V)
External (up to VDD)
Internal temperature sensor
Channel sequencer, selectable 1-pole filter, busy indicator
No pipeline delay, SAR architecture
Single-supply 5 V operation with
1.8 V to 5 V logic interface
Serial interface compatible with SPI, MICROWIRE,
QSPI, and DSP
Power dissipation
26 mW @ 500 kSPS
5.2 μW @ 100 SPS
Standby current: 50 nA
20-lead 4 mm × 4 mm LFCSP package
APPLICATIONS
Battery-powered equipment
Medical instruments: ECG/EKG
Mobile communications: GPS
Personal digital assistants
Power line monitoring
Data acquisition
Seismic data acquisition systems
Instrumentation
Process control
Rev. 0
Information furnishe d by Analog Devices is be lieved to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
REF
with V
up to VDD
REF
Table 1. Multichannel 14-/16-Bit PulSAR® ADC
Type Channels 250 kSPS 500 kSPS ADC Driver
14-Bit 8 AD7949 ADA4841-x
16-Bit 4 AD7682 ADA4841-x
16-Bit 8 AD7689 AD7699 ADA4841-x
GENERAL DESCRIPTION
The AD7699 is an 8-channel, 16-bit, charge redistribution
successive approximation register (SAR) analog-to-digital
converter (ADC) that operates from a single power supply, VDD.
The AD7699 contains all components for use in a multichannel,
low power data acquisition system, including a true 16-bit SAR
ADC with no missing codes; an 8-channel low crosstalk multiplexer useful for configuring the inputs as single-ended (with or
without ground sense), differential, or bipolar; an internal 4.096 V
low drift reference and buffer; a temperature sensor; a selectable
one-pole filter; and a sequencer that is useful when channels are
continuously scanned in order.
The AD7699 uses a simple serial port interface (SPI) for writing
to the configuration register and receiving conversion results.
The SPI interface uses a separate supply, VIO, which is set to the
host logic level. Power dissipation scales with throughput.
The AD7699 is housed in a tiny 20-lead LFCSP with operation
specified from −40°C to +85°C.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113 ©2008 Analog Devices, Inc. All rights reserved.
FUNCTIONAL BLOCK DIAGRAM
Figure 1.
www.analog.com
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