Datasheet AD1938 (Analog Devices) - 3

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Data Sheet AD1938 SPECIFICATIONS TEST CONDITIONS
Performance of all channels is identical, exclusive of the interchannel gain mismatch and interchannel phase deviation specifications. Supply voltages (AVDD, DVDD) 3.3 V Temperature range1 as specified in Table 1 and Table 2 Master clock 12.288 MHz (48 kHz fS, 256 × fS mode) Input sample rate 48 kHz Measurement bandwidth 20 Hz to 20 kHz Word width 24 bits Load capacitance (digital output) 20 pF Load current (digital output) ±1 mA or 1.5 kΩ to ½ DVDD supply Input voltage high 2.0 V Input voltage low 0.8 V 1 Functionally guaranteed at −40°C to +125°C case temperature.
ANALOG PERFORMANCE SPECIFICATIONS
Specifications guaranteed at an ambient temperature of 25°C.
Table 1. Parameter Conditions Min Typ Max Unit
ANALOG-TO-DIGITAL CONVERTERS ADC Resolution All ADCs 24 Bits Dynamic Range 20 Hz to 20 kHz, −60 dB input No Filter (RMS) 98 102 dB With A-Weighted Filter (RMS) 100 105 dB Total Harmonic Distortion + Noise −1 dBFS −96 −87 dB Full-Scale Input Voltage (Differential) 1.9 V rms Gain Error −10 +10 % Interchannel Gain Mismatch −0.25 +0.25 dB Offset Error −10 0 +10 mV Gain Drift 100 ppm/°C Interchannel Isolation −110 dB CMRR 100 mV rms, 1 kHz 55 dB 100 mV rms, 20 kHz 55 dB Input Resistance 14 kΩ Input Capacitance 10 pF Input Common-Mode Bias Voltage 1.5 V DIGITAL-TO-ANALOG CONVERTERS Dynamic Range 20 Hz to 20 kHz, −60 dB input No Filter (RMS) 98 104 dB With A-Weighted Filter (RMS) 100 106 dB With A-Weighted Filter (Average) 108 dB Total Harmonic Distortion + Noise 0 dBFS Single-Ended Version Two channels running −92 dB Single-Ended Version Eight channels running −86 −75 dB Full-Scale Output Voltage 0.88 (2.48) V rms (V p-p) Gain Error −10 +10 % Interchannel Gain Mismatch −0.2 +0.2 dB Offset Error −25 −4 +25 mV Gain Drift −30 +30 ppm/°C Rev. E | Page 3 of 32 Document Outline Features Applications General Description Functional Block Diagram Revision History Specifications Test Conditions Analog Performance Specifications Crystal Oscillator Specifications Digital Input/Output Specifications Power Supply Specifications Digital Filters Timing Specifications Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Analog-to-Digital Converters (ADCs) Digital-to-Analog Converters (DACs) Clock Signals Reset and Power-Down Serial Control Port Power Supply and Voltage Reference Serial Data Ports—Data Format Time-Division Multiplexed (TDM) Modes Daisy-Chain Mode Control Registers Definitions PLL and Clock Control Registers DAC Control Registers ADC Control Registers Additional Modes Applications Circuits Outline Dimensions Ordering Guide Automotive Products