Datasheet AD7729 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | 3 V, Dual Sigma-Delta ADC with Auxiliary DAC |
| Pages / Page | 17 / 3 — AD7729–SPECIFICATIONS1 (AVDD1 = AVDD2 = +3 V. 10%; DVDD1 = DVDD2 = +3 V. … |
| File Format / Size | PDF / 175 Kb |
| Document Language | English |
AD7729–SPECIFICATIONS1 (AVDD1 = AVDD2 = +3 V. 10%; DVDD1 = DVDD2 = +3 V. 10%; DGND = AGND =
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AD7729–SPECIFICATIONS1 (AVDD1 = AVDD2 = +3 V
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10%; DVDD1 = DVDD2 = +3 V
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10%; DGND = AGND = 0 V, fCLK = 13 MHz; RxPOWER1 = 0; RxPOWER0 = 1; MCLKDIV = 0; TA = TMIN to TMAX unless otherwise noted) Parameter AD7729A Units Test Conditions/Comments
REFERENCE REFCAP Absolute Voltage, VREFCAP 1.3 ± 5% V min/max REFCAP TC 50 ppm/°C typ 0.1 µF Capacitor Required from REFCAP to AGND REFOUT Absolute Voltage, VREFOUT 1.3 ± 10% V min/max REFOUT TC 50 ppm/°C typ 0.1 µF Capacitor Required from REFOUT to AGND ADC CHANNEL SPECIFICATIONS RxON = 1 Resolution 15 Bits ADC Signal Range 2 VREFCAP V p-p VBIAS VREFCAP/2 to (AVDD – VREFCAP/2) Volts Differential VREFCAP to (AVDD – VREFCAP) Volts Single-Ended Differential Signal Range VBIAS ± VREFCAP/2 V min/max For Both Positive and Negative Analog Inputs Single-Ended Signal Range VBIAS ± VREFCAP V min/max For Positive Analog Inputs; Negative Analog Inputs = VBIAS Input Sample Rate 13 MSPS Output Word Rate 270.83 kHz DC Accuracy Precalibration Offset Error ±45 mV typ Post Calibration Offset Error ±10 mV max Post Calibration Offset Error TC 50 µV/°C typ TC = Temperature Coefficient Input Resistance (DC) 1.23 MΩ typ Input Capacitance 10 pF typ Dynamic Specifications Input Frequency = 67.7 kHz Dynamic Range 67 dB typ Signal to (Noise + Distortion) 64 dB min Gain Error ±1 dB max Input Frequency = 67.7 kHz, wrt 1.3 V ±0.5 dB max Input Frequency = 67.7 kHz, wrt VREFCAP Gain Match Between Channels ±0.2 dB max Filter Settling Time 47 µs typ Frequency Response Does Not Include Input Antialias RC Circuit 0 kHz –70 kHz ±0.05 dB max/min 85 kHz –1 dB max 96 kHz –3.0 dB max 135 kHz –55 dB max >170 kHz –55 dB max Absolute Group Delay 23 µs typ Group Delay Between Channels (0 kHz–96 kHz) 5 ns typ Coding Twos Complement AUXILIARY CONVERTER2 Resolution 10 Bits Output Range Code 000 2/32 × VREFCAP V Offset Error ±35 mV max Code 3FF 2 VREFCAP V Gain Error –60 mV min +100 mV max DC Accuracy Maximum Output for Specified Accuracy = AVDD – 0.2 V or 2.6 V, Whichever Is Lower Integral Nonlinearity ±4 LSB max Differential Nonlinearity ±2 LSB max Guaranteed Monotonic to 9 Bits Update Rate 540 kHz max Load Resistance 10 kΩ min See Figure 1 Load Capacitance 50 pF max See Figure 1 ISINK 50 µA typ Full-Scale Settling Time 4 µs typ LSB Settling Time 2 µs typ Coding Binary –2– REV. 0
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10%; DVDD1 = DVDD2 = +3 V
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10%; DGND = AGND = 0 V, fCLK = 13 MHz; RxPOWER1 = 0; RxPOWER0 = 1; MCLKDIV = 0; TA = TMIN to TMAX unless otherwise noted) Parameter AD7729A Units Test Conditions/Comments
REFERENCE REFCAP Absolute Voltage, VREFCAP 1.3 ± 5% V min/max REFCAP TC 50 ppm/°C typ 0.1 µF Capacitor Required from REFCAP to AGND REFOUT Absolute Voltage, VREFOUT 1.3 ± 10% V min/max REFOUT TC 50 ppm/°C typ 0.1 µF Capacitor Required from REFOUT to AGND ADC CHANNEL SPECIFICATIONS RxON = 1 Resolution 15 Bits ADC Signal Range 2 VREFCAP V p-p VBIAS VREFCAP/2 to (AVDD – VREFCAP/2) Volts Differential VREFCAP to (AVDD – VREFCAP) Volts Single-Ended Differential Signal Range VBIAS ± VREFCAP/2 V min/max For Both Positive and Negative Analog Inputs Single-Ended Signal Range VBIAS ± VREFCAP V min/max For Positive Analog Inputs; Negative Analog Inputs = VBIAS Input Sample Rate 13 MSPS Output Word Rate 270.83 kHz DC Accuracy Precalibration Offset Error ±45 mV typ Post Calibration Offset Error ±10 mV max Post Calibration Offset Error TC 50 µV/°C typ TC = Temperature Coefficient Input Resistance (DC) 1.23 MΩ typ Input Capacitance 10 pF typ Dynamic Specifications Input Frequency = 67.7 kHz Dynamic Range 67 dB typ Signal to (Noise + Distortion) 64 dB min Gain Error ±1 dB max Input Frequency = 67.7 kHz, wrt 1.3 V ±0.5 dB max Input Frequency = 67.7 kHz, wrt VREFCAP Gain Match Between Channels ±0.2 dB max Filter Settling Time 47 µs typ Frequency Response Does Not Include Input Antialias RC Circuit 0 kHz –70 kHz ±0.05 dB max/min 85 kHz –1 dB max 96 kHz –3.0 dB max 135 kHz –55 dB max >170 kHz –55 dB max Absolute Group Delay 23 µs typ Group Delay Between Channels (0 kHz–96 kHz) 5 ns typ Coding Twos Complement AUXILIARY CONVERTER2 Resolution 10 Bits Output Range Code 000 2/32 × VREFCAP V Offset Error ±35 mV max Code 3FF 2 VREFCAP V Gain Error –60 mV min +100 mV max DC Accuracy Maximum Output for Specified Accuracy = AVDD – 0.2 V or 2.6 V, Whichever Is Lower Integral Nonlinearity ±4 LSB max Differential Nonlinearity ±2 LSB max Guaranteed Monotonic to 9 Bits Update Rate 540 kHz max Load Resistance 10 kΩ min See Figure 1 Load Capacitance 50 pF max See Figure 1 ISINK 50 µA typ Full-Scale Settling Time 4 µs typ LSB Settling Time 2 µs typ Coding Binary –2– REV. 0
