Datasheet AD7699 (Analog Devices)

16-Bit, 8-Channel, 500 kSPS PulSAR ADC Data Sheet AD7699 FEATURES FUNCTIONAL BLOCK DIAGRAM 16-bit resolution with no missing codes 0.5V TO 4.096V 0.5V TO VDD 5V 0.1µF 10µF 8-channel multiplexer with choice of inputs Unipolar single-ended REFIN REF VDD Differential (GND sense) 1.8V BAND GAP Pseudo bipolar VIO TO REF AD7699 VDD Throughput: 500 kSPS TEMP INL: ±0.5 LSB typical, ±1.5 LSB maximum (±23 ppm or FSR) SENSOR Dynamic range: 93.3 dB IN0 CNV IN1 SINAD: 91.5 dB at 20 kHz SCK IN2 MUX 16-BIT SAR SPI SERIAL IN3 ADC INTERFACE THD: −97 dB at 20 kHz SDO IN4 IN5 ONE-POLE DIN Analog input range: 0 V to VREF with VREF up to VDD IN6 LPF SEQUENCER Multiple reference types IN7 Internal 4.096 V COM
01 0
External buffered (up to 4.096 V) GND
4- 35 07
External (up to VDD)
Figure 1.
Internal temperature sensor Channel sequencer, selectable 1-pole filter, busy indicator Table 1. Multichannel 14-/16-Bit PulSAR® ADC No pipeline delay, SAR architecture Type Channels 250 kSPS 500 kSPS ADC Driver Single-supply 5 V operation with
14-Bit 8 AD7949 ADA4841-1
1.8 V to 5 V logic interface
16-Bit 4 AD7682 ADA4841-1
Serial interface compatible with SPI, MICROWIRE,
16-Bit 8 AD7689 AD7699 ADA4841-1
QSPI, and DSP Power dissipation GENERAL DESCRIPTION 26 mW at 500 kSPS 5.2 μW at 100 SPS
The AD7699 is an 8-channel, 16-bit, charge redistribution
Standby current: 50 nA
successive approximation register (SAR) analog-to-digital
20-lead 4 mm × 4 mm LFCSP package
converter (ADC) that operates from a single power supply, VDD.
20-lead 2.4 mm × 2.4 mm WLCSP package
The AD7699 contains all components for use in a multichannel,
APPLICATIONS
low power data acquisition system, including a true 16-bit SAR ADC with no missing codes; an 8-channel low crosstalk multip-
Battery-powered equipment
lexer useful for configuring the inputs as single-ended (with or
Medical instruments: ECG/EKG
without ground sense), differential, or bipolar; an internal 4.096 V
Mobile communications: GPS
low drift reference and buffer; a temperature sensor; a selectable
Personal digital assistants
one-pole filter; and a sequencer that is useful when channels are
Power line monitoring
continuously scanned in order.
Data acquisition Seismic data acquisition systems
The AD7699 uses a simple serial port interface (SPI) for writing
Instrumentation
to the configuration register and receiving conversion results.
Process control
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.
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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 TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY THEORY OF OPERATION OVERVIEW CONVERTER OPERATION TRANSFER FUNCTIONS TYPICAL CONNECTION DIAGRAMS Unipolar or Bipolar Bipolar Single Supply ANALOG INPUTS Input Structure Selectable Low-Pass Filter Input Configurations Sequencer Examples Source Resistance DRIVER AMPLIFIER CHOICE VOLTAGE REFERENCE OUTPUT/INPUT Internal Reference/Temperature Sensor External Reference and Internal Buffer External Reference Reference Decoupling POWER SUPPLY SUPPLYING THE ADC FROM THE REFERENCE DIGITAL INTERFACE READING/WRITING DURING CONVERSION, FAST HOSTS READING/WRITING DURING ACQUISITION, ANY SPEED HOSTS READING/WRITING SPANNING CONVERSION, ANY SPEED HOST CONFIGURATION REGISTER, CFG GENERAL TIMING WITHOUT A BUSY INDICATOR GENERAL TIMING WITH A BUSY INDICATOR READ/WRITE SPANNING CONVERSION WITHOUT A BUSY INDICATOR READ/WRITE SPANNING CONVERSION WITH A BUSY INDICATOR CHANNEL SEQUENCER Examples APPLICATION HINTS LAYOUT EVALUATING AD7699 PERFORMANCE OUTLINE DIMENSIONS ORDERING GUIDE