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LTC2183

16-Bit, 125/105/80Msps Low Power Dual ADCs

Linear Technology 

LTC2185/LTC2184/LTC2183

Digital Inputs and Outputs The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. (Note 5)

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX UNITS

ENCODE INPUTS (ENC+, ENC– )

Differential Encode Mode (ENC– Not Tied to GND)

VID

Differential Input Voltage

VICM

Common Mode Input Voltage

(Note 8)

Internally Set

Externally Set (Note 8)

l

0.2

V

1.2

V

l

1.1

1.6

V

VIN

Input Voltage Range

ENC+, ENC– to GND

l

0.2

3.6

V

RIN

Input Resistance

(See Figure 10)

10

kΩ

CIN

Input Capacitance

Single-Ended Encode Mode (ENC– Tied to GND)

(Note 8)

3.5

pF

VIH

High Level Input Voltage

VIL

Low Level Input Voltage

VIN

Input Voltage Range

VDD = 1.8V

VDD = 1.8V

ENC+ to GND

l

1.2

l

l

0

V

0.6

V

3.6

V

RIN

Input Resistance

(See Figure 11)

30

kΩ

CIN

Input Capacitance

(Note 8)

3.5

pF

DIGITAL INPUTS (CS, SDI, SCK in Serial or Parallel Programming Mode. SDO in Parallel Programming Mode)

VIH

High Level Input Voltage

VIL

Low Level Input Voltage

IIN

Input Current

VDD = 1.8V

VDD = 1.8V

VIN = 0V to 3.6V

l

1.3

l

l

–10

V

0.6

V

10

µA

CIN

Input Capacitance

(Note 8)

3

pF

SDO OUTPUT (Serial Programming Mode. Open-Drain Output. Requires 2kΩ Pull-Up Resistor if SDO is Used)

ROL

Logic Low Output Resistance to GND

IOH

Logic High Output Leakage Current

COUT

Output Capacitance

VDD = 1.8V, SDO = 0V

SDO = 0V to 3.6V

(Note 8)

200

Ω

l

–10

10

µA

3

pF

DIGITAL DATA OUTPUTS (CMOS MODES: FULL DATA RATE AND DOUBLE DATA RATE)

OVDD = 1.8V

VOH

High Level Output Voltage

VOL

Low Level Output Voltage

OVDD = 1.5V

VOH

High Level Output Voltage

IO = –500µA

IO = 500µA

IO = –500µA

l 1.750

1.790

V

l

0.010

0.050

V

1.488

V

VOL

Low Level Output Voltage

IO = 500µA

0.010

V

OVDD = 1.2V

VOH

High Level Output Voltage

VOL

Low Level Output Voltage

DIGITAL DATA OUTPUTS (LVDS MODE)

IO = –500µA

IO = 500µA

1.185

V

0.010

V

VOD

Differential Output Voltage

100Ω Differential Load, 3.5mA Mode

l

247

350

454

mV

100Ω Differential Load, 1.75mA Mode

175

mV

VOS

Common Mode Output Voltage

100Ω Differential Load, 3.5mA Mode

l 1.125

1.250

1.375

V

100Ω Differential Load, 1.75mA Mode

1.250

V

RTERM On-Chip Termination Resistance

Termination Enabled, OVDD = 1.8V

100

Ω

218543f

6

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