LTC2208IUP-14 Просмотр технического описания (PDF) - Linear Technology

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LTC2208IUP-14

14-Bit, 130Msps ADC

Linear Technology 

LTC2208-14

PIN FUNCTIONS

PGA (Pin 64): Programmable Gain Amplifier Control Pin.

Low selects a front-end gain of 1, input range of 2.25VP-P.

High selects a front-end gain of 1.5, input range of

1.5VP-P.

GND (Exposed Pad): ADC Power Ground. The exposed

pad on the bottom of the package must be soldered to

ground.

For LVDS Mode. Standard or Low Power

SENSE (Pin 1): Reference Mode Select and External

Reference Input. Tie SENSE to VDD to select the internal

2.5V bandgap reference. An external reference of 2.5V or

1.25V may be used; both reference values will set a full

scale ADC range of 2.25V (PGA = 0).

GND (Pins 2, 4, 7, 10, 11, 14, 18): ADC Power Ground.

VCM (Pin 3): 1.25V Output. Optimum voltage for input com-

mon mode. Must be bypassed to ground with a minimum

of 2.2μF. Ceramic chip capacitors are recommended.

VDD (Pins 5, 6, 15, 16, 17): 3.3V Analog Supply Pin.

Bypass to GND with 0.1μF ceramic chip capacitors.

AIN+ (Pin 8): Positive Differential Analog Input.

AIN– (Pin 9): Negative Differential Analog Input.

ENC+ (Pin 12): Positive Differential Encode Input. The

sampled analog input is held on the rising edge of ENC+.

Internally biased to 1.6V through a 6.2kΩ resistor. Output

data can be latched on the rising edge of ENC+.

ENC– (Pin 13): Negative Differential Encode Input. The

sampled analog input is held on the falling edge of ENC–.

Internally biased to 1.6V through a 6.2kΩ resistor. By-

pass to ground with a 0.1μF capacitor for a single-ended

Encode signal.

SHDN (Pin 19): Power Shutdown Pin. SHDN = low results

in normal operation. SHDN = high results in powered

down analog circuitry and the digital outputs are set in

high impedance state.

DITH (Pin 20): Internal Dither Enable Pin. DITH = low

disables internal dither. DITH = high enables internal dither.

Refer to Internal Dither section of the data sheet for details

on dither operation.

NC (Pins 21, 22): No Connect.

NC (Pins 23, 24): Do Not Connect in LVDS Mode.

D0–/D0+ to D13–/D13+ (Pins 25-30, 33-38, 41-48 and

51-58): LVDS Digital Outputs. All LVDS outputs require

differential 100Ω termination resistors at the LVDS receiver.

D13+/D13– is the MSB.

OGND (Pins 31 and 50): Output Driver Ground.

OVDD (Pins 32 and 49): Positive Supply for the Output

Drivers. Bypass to ground with 0.1μF capacitor.

CLKOUT–/CLKOUT+ (Pins 39 and 40): LVDS Data Valid

0utput. Latch data on the rising edge of CLKOUT+, falling

edge of CLKOUT–.

OF–/OF+ (Pins 59 and 60): Overflow/Underflow Digital Out-

put OF is high when an over or under flow has occurred.

LVDS (Pin 61): Data Output Mode Select Pin. Connecting

LVDS to 0V selects full rate CMOS mode. Connecting LVDS

to 1/3VDD selects demultiplexed CMOS mode. Connecting

LVDS to 2/3VDD selects Low Power LVDS mode. Connect-

ing LVDS to VDD selects Standard LVDS mode.

MODE (Pin 62): Output Format and Clock Duty Cycle

Stabilizer Selection Pin. Connecting MODE to 0V selects

offset binary output format and disables the clock duty

cycle stabilizer. Connecting MODE to 1/3VDD selects offset

binary output format and enables the clock duty cycle sta-

bilizer. Connecting MODE to 2/3VDD selects 2’s complement

output format and enables the clock duty cycle stabilizer.

Connecting MODE to VDD selects 2’s complement output

format and disables the clock duty cycle stabilizer.

RAND (Pin 63): Digital Output Randomization Selection Pin.

RAND low results in normal operation. RAND high selects

D1-D13 to be EXCLUSIVE-ORed with D0 (the LSB). The

output can be decoded by again applying an XOR operation

between the LSB and all other bits. The mode of operation

reduces the effects of digital output interference.

PGA (Pin 64): Programmable Gain Amplifier Control Pin. Low

selects a front-end gain of 1, input range of 2.25VP-P. High

selects a front-end gain of 1.5, input range of 1.5VP-P.

GND (Exposed Pad Pin 65): ADC Power Ground. The

exposed pad on the bottom of the package must be sol-

dered to ground.

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