AD7699BCPZRL7

The AD7699 is an 8-channel, 16-bit, charge redistribution successive approximation ADC operating from a single supply. The AD7699 contains all the components needed for a multichannel, low power data acquisition system, including: a true 16-bit, no missing codes SAR ADC; an 8-channel, low crosstalk multiplexer for configuring inputs as single-ended (with or without a reference GND), differential, or bipolar; an internal 4.096 V low drift reference and buffer; a temperature sensor; an optional single-pole filter; and a sequencer for automatically sequencing through channels in a multichannel application. The AD7699 uses a simple SPI to write to the configuration register and to receive conversion results. The SPI interface uses a separate supply (VIO), which sets the master logic level. Power consumption is proportional to throughput rate. The AD7699 is housed in a 20-lead miniature LFCSP and operates over a −40°C to +85°C temperature range. The AD7699 is an 8-channel, 16-bit, charge redistribution SAR ADC capable of converting up to 500,000 samples per second (500 kSPS) with power-down between conversions. When operating at 1 kSPS with an external reference, the typical power consumption is 52 μW, making it ideal for battery-powered applications. The AD7699 contains all the components needed for a multichannel, low power data acquisition system, including: - 16-bit, no missing codes SAR ADC - 8-channel, low crosstalk multiplexer - Internal low drift reference and buffer - Temperature sensor with optional single-pole filter - Channel sequencer

Applications

• Battery-powered devices
• Medical instruments: ECG/EKG
• Mobile communications: GPS
• Personal digital assistants
• Power line monitoring
• Data acquisition
• Seismic data acquisition systems
• Instrumentation
• Process control

Key features

• 16-bit resolution, no missing codes
• 8-channel multiplexer, input selectable as unipolar single-ended, differential (with reference ground), or pseudo-bipolar
• Throughput rate: 500 kSPS
• Integral nonlinearity (INL): typical ±0.5 LSB, maximum ±1.5 LSB (±23 ppm of FSR)
• Dynamic range: 93.3 dB
• SINAD: 91.5 dB (20 kHz)
• THD: -97 dB (20 kHz)
• Analog input range: 0 to VREF (VREF up to VDD)
• Multiple reference options: internal 4.096 V reference, external buffered reference (up to 4.096 V), external reference (up to VDD)
• Internal temperature sensor
• Channel sequencer, optional single-pole filter, busy indicator
• No pipeline latency, SAR architecture
• Single-supply operation, 5 V supply voltage, logic interface voltage: 1.8 V to 5 V
• Serial interface compatible with SPI, MICROWIRE, QSPI, and DSP
• Power consumption: 26 mW @ 500 kSPS, 5.2 μW @ 100 SPS
• Standby current: 50 nA
• 20-lead 4 mm × 4 mm LFCSP package