Datasheet

AD7476/AD7477/AD7478
Rev. F | Page 7 of 24
AD7478 SPECIFICATIONS
V
DD
= 2.7 V to 5.25 V, f
SCLK
= 20 MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Table 3.
Parameter A Version
1,2
S Version
1,2
Unit Test Conditions/Comments
DYNAMIC PERFORMANCE f
IN
= 100 kHz sine wave, f
SAMPLE
= 1 MSPS
Signal-to-(Noise + Distortion) (SINAD)
3
49 49 dB min
Total Harmonic Distortion (THD)
3
−65 −65 dB max
Peak Harmonic or Spurious Noise (SFDR)
3
−65 −65 dB max
Intermodulation Distortion (IMD)
3
Second-Order Terms −68 −68 dB typ fa = 498.7 kHz, fb = 508.7 kHz
Third-Order Terms −68 −68 dB typ fa = 498.7 kHz, fb = 508.7 kHz
Aperture Delay 10 10 ns typ
Aperture Jitter 30 30 ps typ
Full Power Bandwidth 6.5 6.5 MHz typ @ 3 dB
DC ACCURACY
Resolution 8 8 Bits
Integral Nonlinearity
3
±0.5 ±0.5 LSB max
Differential Nonlinearity
3
±0.5 ±0.5 LSB max Guaranteed no missed codes to eight bits
Offset Error ±0.5 ±0.5 LSB max
Gain Error ±0.5 ±0.5 LSB max
Total Unadjusted Error (TUE) ±0.5 ±0.5 LSB max
ANALOG INPUT
Input Voltage Ranges 0 to V
DD
0 to V
DD
V
DC Leakage Current ±1 ±1 μA max
Input Capacitance 30 30 pF typ
LOGIC INPUTS
Input High Voltage, V
INH
2.4 2.4 V min
Input Low Voltage, V
INL
0.8 0.8 V max V
DD
= 5 V
0.4 0.4 V max V
DD
= 3 V
Input Current, I
IN
, SCLK Pin ±1 ±1 μA max Typically 10 nA, V
IN
= 0 V or V
DD
Input Current, I
IN
, CS Pin
±1 ±1 μA typ
Input Capacitance, C
IN
4
10 10 pF max
LOGIC OUTPUTS
Output High Voltage, V
OH
V
DD
− 0.2 V
DD
− 0.2 V min I
SOURCE
= 200 μA, V
DD
= 2.7 V to 5.25 V
Output Low Voltage, V
OL
0.4 0.4 V max I
SINK
= 200 μA
Floating-State Leakage Current ±10 ±10 μA max
Floating-State Output Capacitance
4
10 10 pF max
Output Coding Straight (Natural) Binary
CONVERSION RATE
Conversion Time 800 800 ns max 16 SCLK cycles with SCLK at 20 MHz
Track-and-Hold Acquisition Time 400 400 ns max
Throughput Rate 1 1 MSPS max See Serial Interface section
POWER REQUIREMENTS
V
DD
2.7/5.25 2.7/5.25 V min/max
I
DD
Digital I/Ps = 0 V or V
DD
Normal Mode (Static) 2 2 mA typ V
DD
= 4.75 V to 5.25 V, SCLK on or off
1 1 mA typ V
DD
= 2.7 V to 3.6 V, SCLK on or off
Normal Mode (Operational) 3.5 3.5 mA max V
DD
= 4.75 V to 5.25 V, f
SAMPLE
= 1 MSPS
1.6 1.6 mA max V
DD
= 2.7 V to 3.6 V, f
SAMPLE
= 1 MSPS
Full Power-Down Mode 1 1 μA max SCLK off
80 80 μA max SCLK on