Rainbow Electronics MAX1421 - Manual (Page 3)

MAX1421
12-Bit, 40Msps, +3.3V, Low-Power ADC
with Internal Reference
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ELECTRICAL CHARACTERISTICS (continued)
(V AVDD = V DVDD = +3.3V, AGND = DGND = 0, V IN = ±1.024V, differential input voltage at -0.5dB FS, internal reference,
f CLK = 40MHz (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.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Differential Gain DG ±1 %
Differential Phase DP ±0.25 degrees
ANALOG INPUTS (INP, INN, CML)
Input Resistance R IN Either input to ground 32.5 k Ω
Input Capacitance C IN Either input to ground 4 pF
Common-Mode Input Level,
(Note 5)
V CML
V AVDD
× 0.5
V
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
Over-Voltage Recovery OVR 1.5 ✕ FS input 1
Clock
Cycle
INTERNAL REFERENCE (REFIN bypassed with 0.22µF in parallel with 1nF)
Common-Mode Reference Input
Voltage
V CML At CML
V AVDD
✕ 0.5
V
Positive Reference Voltage
Range
V REFP At REFP
V CML
+ 0.512
V
Negative Reference Voltage
Range
V REFN At REFN
V CML
- 0.512
V
Differential Reference Voltage
Range
V
DIFF
V
DIFF
= V
REFP
- V
REFN
1.024
±5%
V
Differential Reference
Temperature Coefficient
REFTC ±100 ppm/ °C
EXTER N AL R EF ER EN C E
REFIN Input Resistance R IN (Note 8) 5 k Ω
REFIN Input Capacitance C
IN
10 pF
REFIN Reference Input Voltage V REFIN
2.048
±10%
V
Differential Reference Voltage 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