Datasheet

AD7440/AD7450A
Rev. C | Page 5 of 28
AD7450A–SPECIFICATIONS
Table 2. V
DD
= 2.7 V to 3.6 V, f
SCLK
= 18 MHz, f
S
= 1 MSPS, V
REF
= 2.0 V; V
DD
= 4.75 V to 5.25 V, f
SCLK
= 18 MHz, f
S
= 1 MSPS,
V
REF
= 2.5 V; V
CM
1
= V
REF A MIN MAX
; T = T to T , unless otherwise noted. Temperature range for B Version: –40°C to +85°C.
Parameter Test Conditions/Comments B Version Unit
DYNAMIC PERFORMANCE f
IN
= 100 kHz
Signal-to-(Noise + Distortion) (SINAD)
2
70 dB min
Total Harmonic Distortion (THD)
2
V
DD
= 4.75 V to 5.25 V, –86 dB typ –76 dB max
V
DD
= 2.7 V to 3.6 V, –84 dB typ –74 dB max
Peak Harmonic or Spurious Noise
2
V
DD
= 4.75 V to 5.25 V, –86 dB typ –76 dB max
V
DD
= 2.7 V to 3.6 V, –84 dB typ –74 dB max
Intermodulation Distortion (IMD)
2
fa = 90 kHz, fb = 110 kHz
Second-Order Terms –89 dB typ
Third-Order Terms –89 dB typ
Aperture Delay
2
5 ns typ
Aperture Jitter
2
50 ps typ
Full Power Bandwidth
2, 3
@ –3 dB 20 MHz typ
@ –0.1 dB 2.5 MHz typ
DC ACCURACY
Resolution 12 Bits
Integral Nonlinearity (INL)
2
±1 LSB max
Differential Nonlinearity (DNL)
2
Guaranteed no missed codes to 12 bits ±0.95 LSB max
Zero-Code Error
2
±6 LSB max
Positive Gain Error
2
±2 LSB max
Negative Gain Error
2
±2 LSB max
ANALOG INPUT
Full-Scale Input Span 2 × V
REF
4
V
IN+
– V
IN–
V
Absolute Input Voltage
V
IN+
V
CM
= V
REF
V
CM
± V
REF
/2 V
V
IN–
V
CM
= V
REF
V
CM
± V
REF
/2 V
DC Leakage Current ±1 μA max
Input Capacitance When in track-and-hold 30/10 pF typ
REFERENCE INPUT
V
REF
Input Voltage
V
DD
= 4.75 V to 5.25 V
(±1% tolerance for specified performance)
2.5
5
V
V
DD
= 2.7 V to 3.6 V
(±1% tolerance for specified performance)
2.0
6
V
DC Leakage Current ±1 μA max
V
REF
Input Capacitance When in track-and-hold 10/30 pF typ
LOGIC INPUTS
Input High Voltage, V
INH
2.4 V min
Input Low Voltage, V
INL
0.8 V max
Input Current, I
IN
Typically 10 nA, V
IN
= 0 V or V
DD
±1 μA max
Input Capacitance, C
IN
7
10 pF max
LOGIC OUTPUTS
Output High Voltage, V
OH
V
DD
= 4.75 V to 5.25 V; I
SOURCE
= 200 μA 2.8 V min
V
DD
= 2.7 V to 3.6 V; I
SOURCE
= 200 μA 2.4 V min
Output Low Voltage, V
OL
I
SINK
= 200 μA 0.4 V max
Floating-State Leakage Current ±1 μA max
Floating-State Output Capacitance
7
10 pF max
Output Coding Twos complement