16-Bit, 8-Channel,

500 kSPS PulSAR ADC

Data Sheet

AD7699

Rev. F

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FEATURES

16-bit resolution with no missing codes

8-channel multiplexer with choice of inputs

Unipolar single-ended

Differential (GND sense)

Pseudo bipolar

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 at 20 kHz

THD: −97 dB at 20 kHz

Analog input range: 0 V to VREF with VREF up to VDD

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 at 500 kSPS

5.2 μW at 100 SPS

Standby current: 50 nA

20-lead 4 mm × 4 mm LFCSP package

20-lead 2.4 mm × 2.4 mm WLCSP 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

FUNCTIONAL BLOCK DIAGRAM

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 VDD

10µF

ONE-POLE

LPF

0.5V TO 4.096V

0.1µF

Figure 1.

Table 1. Multichannel 14-/16-Bit PulSAR® ADC

Type

Channels

250 kSPS

500 kSPS

ADC Driver

14-Bit

8

AD7949

ADA4841-1

16-Bit

4

AD7682

ADA4841-1

16-Bit

8

AD7689

AD7699

ADA4841-1

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 multip-

lexer 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 and a 20-ball

WLCSP with operation specified from −40°C to +85°C.