AD4020 Series

20-Bit, 1.8 MSPS/1 MSPS/500 kSPS, Easy Drive, Differential SAR ADCs

Catalog

20-Bit, 1.8 MSPS/1 MSPS/500 kSPS, Easy Drive, Differential SAR ADCs

Part	Reference Type	Voltage - Supply, Digital [Min]	Voltage - Supply, Digital [Max]	Data Interface	Number of Bits	Package / Case	Number of Inputs	Architecture	Sampling Rate (Per Second)	Number of A/D Converters	Voltage - Supply, Analog [Min]	Voltage - Supply, Analog [Max]	Input Type	Mounting Type	Supplier Device Package	Operating Temperature [Max]	Operating Temperature [Min]
Analog Devices Inc AD4020BCPZ-RL7	External	1.71 V	5.5 V	DSP, MICROWIRE™, QSPI™, SPI™	20	10-VFDFN Exposed Pad, CSP	1	SAR	1.8 M	1	1.71 V	1.89 V	Differential	Surface Mount	10-LFCSP-WD (3x3)	125 °C	-40 °C
Analog Devices Inc AD4020BRMZ	External	1.71 V	5.5 V	DSP, MICROWIRE™, QSPI™, SPI™	20	10-MSOP, 10-TFSOP	1	SAR	1.8 M	1	1.71 V	1.89 V	Differential	Surface Mount	10-MSOP	125 °C	-40 °C
Analog Devices Inc AD4020BRMZ-RL7	External	1.71 V	5.5 V	DSP, MICROWIRE™, QSPI™, SPI™	20	10-MSOP, 10-TFSOP	1	SAR	1.8 M	1	1.71 V	1.89 V	Differential	Surface Mount	10-MSOP	125 °C	-40 °C

Key Features

• Easy DriveGreatly reduced input kickbackInput current reduced to 0.5 μA/MSPSEnhanced acquisition phase, ≥77% of cycle time at 1 MSPSFirst conversion accurate, no latency or pipeline delayInput span compression for single-supply operationFast conversion allows low SPI clock ratesInput overvoltage clamp protection sinks up to 50 mASPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface

• Greatly reduced input kickbackInput current reduced to 0.5 μA/MSPS

• Input current reduced to 0.5 μA/MSPS

• Enhanced acquisition phase, ≥77% of cycle time at 1 MSPS

• First conversion accurate, no latency or pipeline delay

• Input span compression for single-supply operation

• Fast conversion allows low SPI clock rates

• Input overvoltage clamp protection sinks up to 50 mA

• SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface

• High performanceDifferential analog input range: ±VREF, VREFfrom 2.4 V to 5.1 VThroughput: 1.8 MSPS/1 MSPS/500 kSPS optionsINL: ±3.1 ppm maximumGuaranteed 20-bit, no missing codes

• Differential analog input range: ±VREF, VREFfrom 2.4 V to 5.1 V

• Throughput: 1.8 MSPS/1 MSPS/500 kSPS options

• INL: ±3.1 ppm maximum

• Guaranteed 20-bit, no missing codes

• SNR: 100.5 dB at fIN= 1 kHz, VREF= 5 V

• THD: −123 dB at fIN= 1 kHz, −100 dB at fIN= 100 kHz

• SINAD: 89 dB at fIN= 900 kHz (see Figure 17 in the data sheet)

• Oversampled dynamic range104 dB for OSR = 2131 dB for OSR = 1024

• 104 dB for OSR = 2

• 131 dB for OSR = 1024

• Low powerSingle 1.8 V supply operation with 1.71 V to 5.5 V logic interface2.7 mW at 500 kSPS (VDD only)83 μW at 10 kSPS, 15 mW at 1.8 MSPS (total power)

• Single 1.8 V supply operation with 1.71 V to 5.5 V logic interface

• 2.7 mW at 500 kSPS (VDD only)

• 83 μW at 10 kSPS, 15 mW at 1.8 MSPS (total power)

• 10-lead packages: 3 mm × 3 mm LFCSP, 3 mm × 4.90 mm MSOPPin compatible withAD4003/AD4007/AD4011family

• Pin compatible withAD4003/AD4007/AD4011family

• Guaranteed operation: −40°C to +125°C

Description

The AD4020 is a high accuracy, high speed, low power, 20-bit, Easy Drive, precision successive approximation register (SAR) analog-to-digital converter (ADC) that operates from a single power supply, VDD. The reference voltage, VREF, is applied externally and can be set independent of the supply voltage. The AD4020 power scales linearly with throughput.Easy Drive features reduce both signal chain complexity and power consumption while enabling higher channel density. The reduced input current, particularly in high-Z mode, coupled with a long signal acquisition phase, eliminates the need for a dedicated ADC driver. Easy Drive broadens the range of companion circuitry that is capable of driving these ADCs (see Figure 2 in the data sheet).Input span compression eliminates the need to provide a negative supply to the ADC driver amplifier while preserving access to the full ADC code range. The input overvoltage clamp protects the ADC inputs against overvoltage events, minimizing disturbances on the reference pin, and eliminating the need for external protection diodes.Fast device throughput up to 1.8 MSPS allows users to accurately capture high frequency signals and to implement oversampling techniques to alleviate the challenges associated with antialias filter designs. Decreased serial peripheral interface (SPI) clock rate requirements reduce digital input/output power consumption, broadens digital host options, and simplifies the task of sending data across digital isolation. The SPI-compatible serial user interface is compatible with 1.8 V, 2.5 V, 3 V, and 5 V logic by using the separate VIO logic supply.APPLICATIONSAutomatic test equipmentMachine automationMedical equipmentBattery-powered equipmentPrecision data acquisition systemsInstrumentation and control systems