TSA7887 Series ADC Converter

By Touchstone Semiconductor 60

TSA7887 Series ADC Converter

Touchstone Semiconductor's TSA7887, an alternate source for the AD7887, is a self-contained, 2-channel, high-speed, micro-power, 12-bit analog-to-digital converter (ADC) that operates from a single +2.7 V to +5.25 V power supply. The TSA7887 is capable of 125 ksps throughput rate with an external 2 MHz serial clock and draws 0.85 mA supply current. Two electrical grade options for the TSA7887 are available: the TSA7887A with ±2LSB (max) INL and the TSA7887B with ±1LSB (max) INL.

The wideband input track-and-hold acquires signals in 500 ns and features a single-ended sampling topology. Output data coding is straight binary and the ADC is capable of converting full-power signals of up to 2.5 MHz. The ADC also contains an integrated 2.5 V reference or the VREF pin can be overdriven by an external reference.

The TSA7887's provides one or two analog inputs each with an analog input range from 0 to VREF. Efficient circuit design ensures low power consumption of 2 mW (typical) for normal operation and 3 μW in power-down operation.

The TSA7887 is fully specified from -40°C to +125°C and is available in 8-pin SOIC (both TSA7887A and TSA7887B) and MSOP (TSA7887A only) packages.

Key Specifications
  • Alternate source for AD7887
  • Single-supply operation: +2.7 V to +5.25 V
  • INL: ±1LSB - TSA7887B, ±2LSBs - TSA7887A
  • One or two single-ended analog inputs
  • Internal wide-bandwidth track-and-hold
  • Integrated +2.5 V reference
  • Shutdown-mode supply current: 1 μA (max)
  • SPI®/QSPI™/MICROWIRE™/DSP-compatible serial interfaces
  • Flexible power/throughput-rate management
    • 0.85 mA at 125 ksps (Internal VREF ON)
    • 0.7 mA at 125 ksps (Internal VREF OFF)
  • Operating temperature range: -40°C to +125°C
  • 8-pin SOIC and MSOP packaging
  • Battery-powered systems:
    • Personal digital assistants
    • Medical
    • Instruments, mobile communications
  • Instrumentation and control systems
  • High-speed modems