Rainbow Electronics MAX1422 - Manual (Page 3)

MAX1422
12-Bit, 20Msps, +3.3V, Low-Power ADC with
Internal Reference
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Common-Mode Input Voltage
Range (Note 5)
V CMVR
V
CML
±5%
V
Differential Input Range V IN V INP - V INN (Note 6) ±V
DIFF V
Small-Signal Bandwidth BW
-3dB
(Note 7) 400 MHz
Large-Signal Bandwidth FPBW -3dB (Note 7) 150 MHz
Overvoltage Recovery OVR 1.5 ✕ FS input 1
Clock
Cycle
INTERNAL REFERENCE (REFIN bypassed with 0.22 µF in parallel with 1nF)
Common-Mode Reference
Voltage
V CML At CML V AVDD
✕ 0.5 V
Positive Reference Voltage V REFP At REFP
V CML
+ 0.512
V
Negative Reference Voltage V REFN At REFN
V CML
- 0.512
V
Differential Reference Voltage V DIFF V DIFF = V REFP - V REFN
1.024
±5%
V
Differential Reference
Temperature Coefficient
REFTC ±100 ppm/ °C
EXTERNAL REFERENCE (V REFIN = +2.048V)
REFIN Input Resistance R IN (Note 8) 5 k Ω
REFIN Input Capacitance C IN 10 pF
REFIN Reference Input Voltage
Range
V REFIN
2.048
±10%
V
Differential Reference Voltage
Range
V DIFF V DIFF = (V REFP - V REFN )
0.95 ✕
V REFIN /2
V REFIN /2
1.05 ✕
V REFIN /2
V
EXTERNAL REFERENCE (V REFIN = AGND, reference voltage applied to REFP, REFN, and CML)
REFP, REFN, CML Input Current I IN -200 200 µA
REFP, REFN, CML Input
Capacitance
C IN 15 pF
Differential Reference Voltage
Range
V DIFF V DIFF = V REFP - V REFN
1.024
±10%
V
CML Input Voltage Range V CML
1.65
±10%
V
REFP Input Voltage Range V REFP
V CML +
V DIFF /2
V
REFN Input Voltage Range V REFN
V CML -
V DIFF /2
V
DIGITAL INPUTS (CLK, CLK, PD, OE)
Input Logic High V IH
0.7 ✕
V DVDD
V
Input Logic Low V
IL
0.3 ✕
V DVD
V
ELECTRICAL CHARACTERISTICS (continued)
(V AVDD = V DVDD = +3.3V, AGND = DGND = 0, V IN = ±1.024V, differential input voltage at -0.5dB FS, +2.048V internal reference, f CLK =
20MHz (50% duty cycle), digital output load C L
≈ 10pF, T
A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)