TL5501 Datasheet, PDF (2/7 Pages) Texas Instruments – 6-BIT ANALOG-TO-DIGITAL CONVERTER

TL5501
6-BIT ANALOG-TO-DIGITAL CONVERTER
SLAS026 – OCTOBER 1989 – REVISED APRIL 1990
equivalents of analog input circuit
ANLG VCC
VI
ANLG VCC
D
VI
Ci
Ibias
ri
ANLG GND
(see Note A)
VrefB
NOTE A: Ci – nonlinear emitter-follower junction capacitance
ri – linear resistance model for input current transition caused by comparator switching.
VI < VrefB: Infinite; CLK high: infinite.
VrefB – voltage at REFB terminal
Ibias – constant input bias current
D – base-collector junction diode of emitter-follower transistor
equivalent of digital input circuit
DGTL VCC
25 kΩ
3.1 kΩ
25 kΩ
Output
VI
GND
Vref = 1.4 V
2
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