Datasheet Analog Devices AD7176-2 — 数据表

24-Bit, 250 kSPS Sigma-Delta ADC
with 20 µs Settling
AD7176-2 Data Sheet
FEATURES GENERAL DESCRIPTION Fast and flexible output rate—5 SPS to 250 kSPS
Fast settling time—20 µs
Channel scan data rate of 50 kSPS/channel
Performance specifications
17 noise free bits at 250 kSPS
20 noise free bits at 2.5 kSPS
22 noise free bits at 5 SPS
INL ±2.5 ppm of FSR
85 dB rejection of 50 Hz and 60 Hz with 50 ms settling
User-configurable input channels
2 fully differential or 4 pseudo differential
Crosspoint multiplexer
On-chip 2.5 V reference (drift 2 ppm/°C)
Internal oscillator, external crystal, or external clock
Power supply
Single supply: 5 V AVDD1, 2 V to 5 V AVDD2 and IOVDD
Optional split supply: AVDD1 and AVSS ± 2.5 V
Current: 7.8 mA
Temperature range: −40°C to +105°C
3-or 4-wire serial digital interface (Schmitt trigger on SCLK) …

Key Sheet AD7176-2 One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com Highlights of the AD7176-2—24-Bit, 250 kSPS Sigma-Delta ADC with 20 µs Settling
AVDD1 IOVDD REGCAPD AVDD2 REGCAPA REF– REF+ REFOUT
BUFFERED
PRECISION
REFERENCE 1.8V
LDO 1.8V
LDO INT
REF AIN0 CS
AIN1
Σ-Δ ADC AIN2 DIGITAL
FILTER SERIAL
INTERFACE
AND CONTROL SCLK
DIN
DOUT/RDY AIN3
I/O
CONTROL AD7176-2 CROSSPOINT
MULTIPLEXER
AVSS GPIO0 GPIO1 XTAL1 CLKIO/XTAL2 DGND 11266-001 AIN4 SYNC/ERROR XTAL AND INTERNAL
CLOCK OSCILLATOR
CIRCUITRY Figure 1. Functional Block Diagram GENERAL DESCRIPTION FEATURES AND BENEFITS This key sheet provides users with an overview of the AD7176-2.
Key attributes of the part include the following: The AD7176-2 offers the following features and benefits: 1 • • • • •
• 1 Designed for process control: PLC/DCS modules, temperature …