LTC2172-12 Linear Technology, LTC2172-12 Datasheet - Page 17

• Manufacturer Part Number: LTC2172-12
• Description: (LTC217x-12) 65Msps/40Msps/ 25Msps Low Power Quad ADCs
• Manufacturer: Linear Technology

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PIN FUNCTIONS
PAR/SER (Pin 47): Programming Mode Selection Pin.
Connect to ground to enable serial programming mode.
CS, SCK, SDI and SDO become a serial interface that con-
trols the A/D operating modes. Connect to V
parallel programming mode where CS, SCK, SDI and SDO
become parallel logic inputs that control a reduced set of
the A/D operating modes. PAR/SER should be connected
directly to ground or the V
by a logic signal.
V
with a 1μF ceramic capacitor, nominally 1.25V.
SENSE (Pin 50): Reference Programming Pin. Connect-
ing SENSE to V
±1V input range. Connecting SENSE to ground selects
the internal reference and a ±0.5V input range. An external
reference between 0.625V and 1.3V applied to SENSE
selects an input range of ±0.8 • V
REF
(Pin 48): Reference Voltage Output. Bypass to ground
DD
selects the internal reference and a
DD
of the part and not be driven
SENSE
.
DD
to enable
LVDS OUTPUTS
The following pins are differential LVDS outputs. The
output current level is programmable. There is an op-
tional internal 100Ω termination resistor between the
pins of each LVDS output pair.
OUT4B
Pins 25/ 26): Serial Data Outputs for Channel 4. In 1-lane
output mode, only OUT4A
OUT3B
Pins 29/30): Serial Data Outputs for Channel 3. In
1-lane output mode, only OUT3A
FR
DCO
OUT2B
Pins 39/40): Serial Data Outputs for Channel 2. In
1-lane output mode, only OUT2A
OUT2B
Pins 43/44): Serial Data Outputs for Channel 1. In
1-lane output mode, only OUT1A
–
/FR
–
/DCO
LTC2171-12/LTC2170-12
+
–
–
–
–
/OUT4B
/OUT3B
(Pin 31/Pin 32): Frame Start Output.
/OUT2B
/OUT2B
+
(Pin 35/Pin 36): Data Clock Output.
+
+
+
+
, OUT4A
, OUT3A
, OUT2A
, OUT2A
–
/OUT4A
–
–
–
–
/OUT4A
/OUT3A
/OUT2A
/OUT2A
LTC2172-12/
–
–
–
/OUT3A
/OUT2A
/OUT1A
+
are used.
+
+
+
+
(Pins 23/24,
(Pins 27/28,
(Pins 37/38,
(Pins 41/42,
+
+
+
are used.
are used.
are used.
17
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