MAX1213N Datasheet, PDF (11/21 Pages) Maxim Integrated Products – 1.8V, Low-Power, 12-Bit, 170Msps ADC for Broadband Applications

1.8V, Low-Power, 12-Bit, 170Msps
ADC for Broadband Applications
Analog Inputs (INP, INN)
INP and INN are the fully differential inputs of the
MAX1213N. Differential inputs usually feature good
rejection of even-order harmonics, which allows for
enhanced AC performance as the signals are progress-
ing through the analog stages. The MAX1213N analog
inputs are self-biased at a 0.74V common-mode voltage
and allow a 1.38V_P-P differential input voltage swing
(Figure 2). Both inputs are self-biased through 900Ω
resistors, resulting in a typical differential input resis-
tance of 1.8kΩ. Drive the analog inputs of the
MAX1213N in AC-coupled configuration to achieve the
best dynamic performance. See the Transformer-
Coupled, Differential Analog Input Drive section.
AV_CC
INP
C_P
900Ω
900Ω
INN
C_P
C_S IS THE SAMPLING CAPACITANCE
C_P IS THE PARASITIC CAPACITANCE _˜ 1pF
INP
V_CM
INN
GND
INP - INN
T/H
MAX1213N
C_S
12-BIT PIPELINE
ADC
C_S
FROM CLOCK-
MANAGEMENT BLOCK
TO COMMON MODE
V_CM + V_FS / 4
V_CM - V_FS / 4
+V_FS / 2
GND
Figure 2. Simplified Analog Input Architecture and Allowable Input Voltage Range
-V_FS / 2
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