LHA8951F
The LHA8951 is an 18-bit successive approximation register (SAR) analog-to-digital converter (ADC) operating from a single supply (VDD). It integrates a low-power high-speed 18-bit sampling ADC and a versatile serial interface port. On the rising edge of CNV, the LHA8951 samples the differential voltage between the IN+ and IN- pins; the voltage swings on these pins are typically complementary between 0 V and VREF. The reference voltage (REF) is supplied externally and can operate independently of the analog supply VDD. Power consumption varies linearly with throughput rate.
The SPI-compatible serial interface uses the SDI input to daisy-chain multiple ADCs onto a 3-wire bus, with an optional busy status indicator. A separate VIO supply rail enables logic-level compatibility with 1.8 V, 2.5 V, 3 V, and 5 V host logic.
The LHA8951 is available in 10-lead MSOP and 10-lead 3 mm × 3 mm QFN packages, with an operating temperature range of -40 °C to +125 °C.
Product Features
- 18-bit resolution, no missing codes
- Throughput rate:
- LHA8951F: 1 MSPS
- LHA8951C: 500 kSPS
- Low power consumption
- 3.6 mW @ 1 MSPS (VDD only)
- 7 mW total power @ 1 MSPS
- 70 μW @ 10 kSPS
- Integral Non-Linearity (INL): ±1 LSB typical
- Dynamic range: 99 dB
- SNR: 98 dB
- SINAD: 97.8 dB
- THD: -116 dB
- True differential analog input range: ±VREF
- 0 V to VREF (VREF ranges from 2.5 V to 5.0 V)
- Pseudo-differential analog input
- Arbitrary common-mode input
- Single-ended input
- No pipeline latency
- Single 1.8 V supply operation, SPI logic interface compatible with 1.8 V / 2.5 V / 3 V / 5 V logic levels
- Daisy-chainable multiple ADCs with optional busy indicator output
- 10-lead packages: MSOP and 3 mm × 3 mm QFN
Application Scenario
- Battery-powered equipment
- Data acquisition systems
- Medical instrumentation
- Seismic data acquisition systems
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