Electrical characteristics (continued) – Maxim Integrated MAX12557 User Manual
Page 4
MAX12557
Dual, 65Msps, 14-Bit, IF/Baseband ADC
4
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 3.3V, OV
DD
= 2.0V, GND = 0, REFIN = REFOUT (internal reference), C
L
≈ 10pF at digital outputs, V
IN
= -0.5dBFS (differen-
tial), DIFFCLK/SECLK = OV
DD
, PD = GND, SHREF = GND, DIV2 = GND, DIV4 = GND, G/T = GND, f
CLK
= 65MHz, T
A
= -40°C to
+85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Overdrive Recovery Time
±10% beyond full scale
1
Clock
Cycle
INTERCHANNEL CHARACTERISTICS
f
INA
or f
INB
= 70MHz at -0.5dBFS
90
Crosstalk Rejection
f
INA
or f
INB
= 175MHz at -0.5dBFS
85
dB
Gain Matching
±0.01
±0.1
dB
Offset Matching
±0.01
%FSR
INTERNAL REFERENCE (REFOUT)
REFOUT Output Voltage
V
REFOUT
2.000
2.048
2.080
V
REFOUT Load Regulation
-1mA < I
REFOUT
< +1mA
35
mV/mA
REFOUT Temperature Coefficient
TC
REF
±50
ppm/°C
Short to V
DD
—sinking
0.24
REFOUT Short-Circuit Current
Short to GND—sourcing
2.1
mA
BUFFERED REFERENCE MODE (REFIN is driven by REFOUT or an external 2.048V single-ended reference source;
V
REFAP
/V
REFAN
/V
COMA
and V
REFBP
/V
REFBN
/V
COMB
are generated internally)
REFIN Input Voltage
V
REFIN
2.048
V
REFIN Input Resistance
R
REFIN
>50
M
Ω
COM_ Output Voltage
V
COMA
V
COMB
V
DD
/ 2
1.60
1.65
1.70
V
REF_P Output Voltage
V
REFAP
V
REFBP
V
DD
/ 2 + (V
REFIN
x 3/8)
2.418
V
REF_N Output Voltage
V
REFAN
V
REFBN
V
DD
/ 2 - (V
REFIN
x 3/8)
0.882
V
Differential Reference Voltage
V
REFA
V
REFB
V
REFA
= V
REFAP
- V
REFAN
V
REFB
= V
REFBP
- V
REFBN
1.460
1.536
1.580
V
Differential Reference
Temperature Coefficient
TC
REF
±25
ppm/°C
UNBUFFERED EXTERNAL REFERENCE (REFIN = GND, V
REFAP
/V
REFAN
/V
COMA
and V
REFBP
/V
REFBN
/V
COMB
are applied
externally, V
COMA
= V
COMB
= V
DD
/ 2)
REF_P Input Voltage
V
REFAP
V
REFBP
V
REF_P
- V
COM
+0.768
V
REF_N Input Voltage
V
REFAN
V
REFBN
V
REF_N
- V
COM
-0.768
V
COM_ Input Voltage
V
COM
V
DD
/ 2
1.65
V
Differential Reference Voltage
V
REFA
V
REFB
V
REF_
= V
REF_P
- V
REF_N
= V
REFIN
x 3/4
1.536
V