ADS7871 14-Bit 48KSPS DAS with ADC, MUX, PGA and Internal Reference | TI.com

ADS7871 (ACTIVE)

14-Bit 48KSPS DAS with ADC, MUX, PGA and Internal Reference

 

Description

The ADS7871 (US patents 6140872, 6060874) is a complete low power data acquisition system on a single chip. It consists of a 4-channel differential/8-channel single-ended multiplexer, precision programmable gain amplifier, 14-bit successive approximation analog-to-digital (A/D) converter and a precision voltage reference.

The programmable-gain amplifier provides high input impedance, excellent gain accuracy, good common-mode rejection, and low noise.

For many low-level signals, no external amplification or impedance buffering is needed between the signal source and the A/D input.

The offset voltage of the PGA is auto zeroed. Gains of 1, 2, 4, 5, 8, 10, 16, and 20 V/V allow signals as low as 125 mV to produce full-scale digital outputs.

The ADS7871 contains an internal reference, which is trimmed for high initial accuracy and stability vs temperature. Drift is typically 10 ppm/°C. An external reference can be used in situations where multiple ADS7871s share a common reference.

The serial interface allows the use of SPI™, QSPI™, Microwire™, and 8051-family protocols, without glue logic.

Features

  • PGA Gains: 1, 2, 4, 5, 8, 10, 16, 20 V/V
  • Programmable Input (Up to 4-Channel Differential/Up to 8-Channel Single-Ended or Some Combination)
  • 1.15-V, 2.048-V, or 2.5-V Internal Reference
  • SPI/DSP Compatible Serial Interface ( 20 MHz)
  • Throughput Rate: 48 kSamples/sec
  • Error Overload Indicator
  • Programmable Output 2s Complement/Binary
  • 2.7-V to 5.5-V Single Supply Operation
  • 4-Bit Digital I/O Via Serial Interface
  • Pin Compatible With ADS7870
  • SSOP-28 Package
  • APPLICATIONS
    • Portable Battery-Powered Systems
    • Low-Power Instrumentation
    • Low-Power Control Systems
    • Smart Sensor Applications

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Parametrics Compare all products in Precision ADCs (<=10MSPS)

 
Resolution (Bits)
Sample Rate (Max) (kSPS)
Number of input channels
Interface
Operating temperature range (C)
Package Group
Approx. price (US$)
Power consumption (Typ) (mW)
Package size: mm2:W x L (PKG)
Architecture
Input type
Multi-channel configuration
Reference mode
Features
Input range (Max) (V)
Input range (Min) (V)
Analog voltage AVDD (Min) (V)
Analog voltage AVDD (Max) (V)
Digital supply (Min) (V)
Digital supply (Max) (V)
INL (Max) (+/-LSB)
Rating
ADS7871
14    
48    
8    
SPI    
-40 to 85    
SSOP | 28    
5.37 | 1ku    
8.5    
28SSOP: 54 mm2: 5.3 x 10.2 (SSOP | 28)    
SAR    
Differential
Single-Ended    
Multiplexed    
Ext
Int    
Oscillator
PGA    
5.5    
0    
2.7    
5.5    
2.7    
5.5    
4    
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