LTC2233 Linear Technology, LTC2233 Datasheet - Page 12

• Manufacturer Part Number: LTC2233
• Description: 10-Bit 105Msps/80Msps ADCs
• Manufacturer: Linear Technology

PI FU CTIO S
LTC2232/LTC2233
A
A
REFHA (Pins 3, 4): ADC High Reference. Bypass to Pins
5, 6 with 0.1µF ceramic chip capacitor, to Pins 9, 10 with
a 2.2µF ceramic capacitor and to ground with a 1µF
ceramic capacitor.
REFLB (Pins 5, 6): ADC Low Reference. Bypass to Pins 5,
6 with 0.1µF ceramic chip capacitor. Do not connect to
Pins 9, 10.
REFHB (Pins 7, 8): ADC High Reference. Bypass to Pins
9, 10 with 0.1µF ceramic chip capacitor. Do not connect to
Pins 3, 4.
REFLA (Pins 9, 10): ADC Low Reference. Bypass to Pins
7, 8 with 0.1µF ceramic chip capacitor, to Pins 3, 4 with a
2.2µF ceramic capacitor and to ground with a 1µF ceramic
capacitor.
V
GND with 0.1µF ceramic chip capacitors. Adjacent pins
can share a bypass capacitor.
GND (Pins 13, 15, 45, 48): ADC Power Ground.
ENC+ (Pin 16): Encode Input. The input is sampled on the
positive edge.
ENC– (Pin 17): Encode Complement Input. The input is
sampled on the negative edge. Bypass to ground with
0.1µF ceramic for single-ended ENCODE signal.
SHDN (Pin 18): Shutdown Mode Selection Pin. Connect-
ing SHDN to GND and OE to GND results in normal
operation with the outputs enabled. Connecting SHDN to
GND and OE to V
outputs at high impedance. Connecting SHDN to V
OE to GND results in nap mode with the outputs at high
impedance. Connecting SHDN to V
results in sleep mode with the outputs at high impedance.
12
IN
IN
DD
U
+ (Pin 1): Positive Differential Analog Input.
– (Pin 2): Negative Differential Analog Input.
(Pins 11, 12, 14, 46, 47): 3.3V Supply. Bypass to
U
DD
U
results in normal operation with the
DD
and OE to V
DD
and
DD
OE (Pin 19): Output Enable Pin. Refer to SHDN pin
function.
CLOCKOUT (Pin 20): Data Valid Output. Latch data on the
falling edge of CLKOUT.
NC (Pins 21, 24): Do not connect these pins.
D0 – D9 (Pins 25, 26, 29, 30, 31, 34, 35, 36, 39, 40):
Digital Outputs. D9 is the MSB.
OGND (Pins 22, 27, 32, 38): Output Driver Ground.
OV
Output Drivers. Bypass to ground with 0.1µF ceramic chip
capacitors.
OF (Pin 41): Over/Under Flow Output. High when an over
or under flow has occurred.
MODE (Pin 42): Output Format and Clock Duty Cycle
Stabilizer Selection Pin. Connecting MODE to 0V selects
offset binary output format and turns the clock duty cycle
stabilizer off. Connecting MODE to 1/3 V
binary output format and turns the clock duty cycle stabi-
lizer on. Connecting MODE to 2/3 V
ment output format and turns the clock duty cycle stabi-
lizer on. Connecting MODE to V
output format and turns the clock duty cycle stabilizer off.
SENSE (Pin 43): Reference Programming Pin. Connecting
SENSE to V
input range. V
input range. An external reference greater than 0.5V and
less than 1V applied to SENSE selects an input range of
±V
V
Bypass to ground with 2.2µF ceramic chip capacitor.
Exposed Pad (Pin 49): ADC Power Ground. The exposed
pad on the bottom of the package needs to be soldered to
ground.
CM
SENSE
DD
(Pin 44): 1.6V Output and Input Common Mode Bias.
(Pins 23, 28, 33, 37): Positive Supply for the
. ±1V is the largest valid input range.
CM
DD
selects the internal reference and a ±0.5V
selects the internal reference and a ±1V
DD
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selects 2’s complement
DD
selects 2’s comple-
DD
selects offset
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