Datasheet

REV. B
–4–
AD7470/AD7472
AD7472–SPECIFICATIONS
1
(V
DD
= 2.7 V to 5.25 V
2
, REF IN = 2.5 V,Y Version: f
CLKIN
= 20 MHz @ 5 V and
14 MHz @ 3 V; T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
Parameter Y Version
1
Unit Test Conditions/Comments
DYNAMIC PERFORMANCE 5 V 3 V f
S
= 1.2 MSPS @ 5 V, f
S
= 875 kSPS @ 3 V
Signal to Noise + Distortion (SINAD) 69 69 dB typ f
IN
= 500 kHz Sine Wave
68 68 dB min f
IN
= 100 kHz Sine Wave
Signal-to-Noise Ratio (SNR) 70 70 dB typ f
IN
= 500 kHz Sine Wave
68 68 dB min f
IN
= 100 kHz Sine Wave
Total Harmonic Distortion (THD) –83 –78 dB typ f
IN
= 500 kHz Sine Wave
–83 –84 dB typ f
IN
= 100 kHz Sine Wave
–75 –75 dB max f
IN
= 100 kHz Sine Wave
Peak Harmonic or Spurious Noise (SFDR) –86 –81 dB typ f
IN
= 500 kHz Sine Wave
–86 –86 dB typ f
IN
= 100 kHz Sine Wave
–76 –76 dB max f
IN
= 100 kHz Sine Wave
Intermodulation Distortion (IMD)
Second-Order Terms –77 –77 dB typ f
IN
= 500 kHz Sine Wave
–86 –86 dB typ f
IN
= 100 kHz Sine Wave
Third-Order Terms –77 –77 dB typ f
IN
= 500 kHz Sine Wave
–86 –86 dB typ f
IN
= 100 kHz Sine Wave
Aperture Delay 5 5 ns typ
Aperture Jitter 15 15 ps typ
Full Power Bandwidth 20 20 MHz typ @ 3 dB
DC ACCURACY f
S
= 1.2 MSPS @ 5 V; f
S
= 875 kSPS @ 3 V
Resolution 12 12 Bits
Integral Nonlinearity ± 2 ± 2 LSB max
Differential Nonlinearity ± 1.8 ± 1.8 LSB max Guaranteed No Missed Codes to 11 Bits
Offset Error ± 10 ± 10 LSB max
Gain Error ± 2 ± 2 LSB max
ANALOG INPUT
Input Voltage Ranges 0 to REF IN 0 to REF IN V
DC Leakage Current ± 1 ± 1 µA max
Input Capacitance 33 33 pF typ
REFERENCE INPUT
REF IN Input Voltage Range 2.5 2.5 V ±1% for Specified Performance
DC Leakage Current ± 1 ± 1 µA max
Input Capacitance 10/20 10/20 pF typ Track-and-Hold Mode
LOGIC INPUTS
Input High Voltage, V
INH
2.4 2.4 V min
Input Low Voltage, V
INL
0.4 0.4 V max
Input Current, I
IN
± 1 ± 1 µA max Typically 10 nA, V
IN
= 0 V or V
DD
Input Capacitance, C
IN
3
10 10 pF max
LOGIC OUTPUTS
Output High Voltage, V
OH
V
DRIVE
– 0.2 V
DRIVE
– 0.2 V min I
SOURCE
= 200 µA
Output Low Voltage, V
OL
0.4 0.4 V max I
SINK
= 200 µA
Floating-State Leakage Current ± 10 ± 10 µA max V
DD
= 2.7 V to 5.25 V
Floating-State Output Capacitance 10 10 pF max
Output Coding Straight (Natural) Binary
CONVERSION RATE
Conversion Time 14 14 CLK IN Cycles (max)
Track-and-Hold Acquisition Time 140 140 ns min
Throughput Rate 1200 875 kSPS max Conversion Time + Acquisition Time
POWER REQUIREMENTS
V
DD
+2.7/+5.25 V min/max
I
DD
4
Digital Inputs = 0 V or DV
DD
Normal Mode 2.4 mA max V
DD
= 4.75 V to 5.25 V; f
S
= 1.2 MSPS; Typ 2 mA
Quiescent Current 900 µA max V
DD
= 4.75 V to 5.25 V; f
S
= 1.2 MSPS
Normal Mode 1.5 mA max V
DD
= 2.7 V to 3.3 V; f
S
= 875 kSPS; Typ 1.3 mA
Quiescent Current 800 µA max V
DD
= 2.7 V to 3.3 V; f
S
= 875 kSPS
Sleep Mode 2 µA max CLK IN = 0 V or DV
DD
Power Dissipation
4
Digital Inputs = 0 V or DV
DD
Normal Mode 12 mW max V
DD
= 5 V
4.5 mW max V
DD
= 3 V
Sleep Mode 10 µW max V
DD
= 5 V; CLK IN = 0 V or DV
DD
6 µW max V
DD
= 3 V; CLK IN = 0 V or DV
DD
NOTES
1
Temperature ranges as follows: Y Version: –40°C to +125°C.
2
The AD7472 functionally works at 2.35 V. Typical specifications @ 25°C for SNR (100 kHz) = 68 dB; THD (100 kHz) = –84 dB; INL ± 0.8 LSB.
3
Sample tested @ 25°C to ensure compliance.
4
See Power vs. Throughput Rate section.
Specifications subject to change without notice.