MAX1444 Datasheet, PDF (4/20 Pages) Maxim Integrated Products – 10-Bit, 40Msps, 3.0V, Low-Power ADC with Internal Reference

10-Bit, 40Msps, 3.0V, Low-Power
ADC with Internal Reference
ELECTRICAL CHARACTERISTICS (continued)
(V_DD = 3V; OV_DD = 2.7V; 0.1µF and 1µF capacitors from REFP, REFN, and COM to GND; V_REFIN = 2.048V; REFOUT connected to
REFIN through a 10kΩ resistor; V_IN = 2V_P-P (differential with respect to COM); C_L = 10pF at digital outputs; f_CLK = 40MHz; T_A = T_MIN
to T_MAX, unless otherwise noted. ≥ +25°C guaranteed by production test, < +25°C guaranteed by design and characterization; typi-
cal values are at T_A = +25°C.)
PARAMETER
Maximum REFP, COM Source
Current
SYMBOL
I_SOURCE
CONDITIONS
MIN
TYP
MAX UNITS
5
mA
Maximum REFP, COM Sink
Current
I_SINK
-250
µA
Maximum REFN Source Current I_SOURCE
250
µA
Maximum REFN Sink Current
I_SINK
-5
mA
UNBUFFERED EXTERNAL REFERENCE (V_REFIN = AGND, reference voltage applied to REFP, REFN, and COM)
REFP, REFN Input Resistance
R_REFP, Measured between REFP and COM
4
kΩ
R_REFN and REFN and COM
REFP, REFN, COM Input
Capacitance
C_IN
15
pF
Differential Reference Input
Voltage Range
∆V_REF ∆V_REF = V_REFP - V_REFN
1.024
±10%
V
COM Input Voltage Range
V_COM
V_DD / 2
±10%
V
REFP Input Voltage
V_REFP
V_COM +
∆V_REF /
V
2
REFN Input Voltage
V_REFN
DIGITAL INPUTS (CLK, PD, OE)
Input High Threshold
CLK
V_IH
PD, OE
Input Low Threshold
CLK
V_IL
PD, OE
V_COM -
∆V_REF /
V
2
0.8 ×
V_DD
0.8 ×
OV_DD
V
0.2 ×
V_DD
V
0.2 ×
OV_DD
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