LTM9012 datasheet(11/28 Pages) LINER

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LTM9012

9012f

pin FuncTions

VCC1 (H10, H13): Channel 1 Amplifier Supply. VCC is

internally bypassed to ground with 0.1µF in parallel with

0.01µF ceramic capacitors, additional bypass capacitance

is optional. The recommended operating voltage is 3.3V.

VCC2 (C8, C12): Channel 2 Amplifier Supply. VCC is in-

ternally bypassed to ground with 0.1µF in parallel with

0.01µF ceramic capacitors, additional bypass capacitance

is optional. The recommended operating voltage is 3.3V.

VCC3 (C2, C6): Channel 3 Amplifier Supply. VCC is in-

ternally bypassed to ground with 0.1µF in parallel with

0.01µF ceramic capacitors, additional bypass capacitance

is optional. The recommended operating voltage is 3.3V.

VCC4 (H1, H4): Channel 4 Amplifier Supply. VCC is in-

ternally bypassed to ground with 0.1µF in parallel with

0.01µF ceramic capacitors, additional bypass capacitance

is optional. The recommended operating voltage is 3.3V.

VDD (N4, N5, N9, N10): ADC Analog Supply. VDD is inter-

nally bypassed to ground with 0.1µF ceramic capacitors,

additional bypass capacitance is optional. The recom-

mended operating voltage is 1.8V.

OVDD (R7, R8, S8): ADC Digital Output Supply. OVDD

is internally bypassed to ground with 0.1µF ceramic ca-

pacitors, additional bypass capacitance is optional. The

recommended operating voltage is 1.8V.

GND: Ground. Use multiple vias close to pins.

CH1+ (A11): Channel 1 Noninverting Analog Input.

CH1– (A12): Channel 1 Inverting Analog Input.

CH2+ (A8): Channel 2 Noninverting Analog Input.

CH2– (A9): Channel 2 Inverting Analog Input.

CH3+ (A5): Channel 3 Noninverting Analog Input.

CH3– (A6): Channel 3 Inverting Analog Input.

CH4+ (A2): Channel 4 Noninverting Analog Input.

CH4– (A3): Channel 4 Inverting Analog Input.

SHDN1 (G11): Channel 1 Amplifier Shutdown. Connect-

ing SHDN1 to VCC or floating results in normal (active)

operating mode. Connecting SHDN1 to GND results in a

low power shutdown state on amplifier 1.

SHDN2 (D9): Channel 2 Amplifier Shutdown. Connect-

ing SHDN2 to VCC or floating results in normal (active)

operating mode. Connecting SHDN2 to GND results in a

low power shutdown state on amplifier 2.

SHDN3 (D3): Channel 3 Amplifier Shutdown. Connect-

ing SHDN3 to VCC or floating results in normal (active)

operating mode. Connecting SHDN3 to GND results in a

low power shutdown state on amplifier 3.

SHDN4 (G1): Channel 4 Amplifier Shutdown. Connect-

ing SHDN4 to VCC or floating results in normal (active)

operating mode. Connecting SHDN4 to GND results in a

low power shutdown state on amplifier 4.

ENC+ (N1): Encode Input. Conversion starts on the rising

edge.

ENC– (P1): Encode Complement Input. Conversion starts

on the falling edge.

CS (P4): In serial programming mode, (PAR/SER = 0V),

CS is the serial interface chip select input. When CS is

low, SCK is enabled for shifting data on SDI into the mode

controlregisters.Intheparallelprogrammingmode(PAR/

SER = VDD), CS selects 2-lane or 1-lane output mode. CS

can be driven with 1.8V to 3.3V logic.

SCK (P5): In serial programming mode, (PAR/SER =

0V), SCK is the serial interface clock input. In the parallel

programming mode (PAR/SER = VDD),SCKselects3.5mA

or 1.75mA LVDS output currents. SCK can be driven with

1.8V to 3.3V logic.

SDI (P3): In serial programming mode, (PAR/SER = 0V),

SDIistheserialinterfacedataInput.DataonSDIisclocked

into the mode control registers on the rising edge of SCK.

In the parallel programming mode (PAR/SER = VDD), SDI

can be used to power down the part. SDI can be driven

with 1.8V to 3.3V logic.

SDO (P9): In serial programming mode, (PAR/SER = 0V),

SDO is the optional serial interface data output. Data on

SDO is read back from the mode control registers and can

be latched on the falling edge of SCK. SDO is an open-

drain NMOS output that requires an external 2k pull-up

resistor to 1.8V – 3.3V. If read back from the mode control

registers is not needed, the pull-up resistor is not neces-

sary and SDO can be left unconnected. In the parallel

programming mode (PAR/SER = VDD), SDO is an input

that enables internal 100Ω termination resistors. When

used as an input, SDO can be driven with 1.8V to 3.3V

logic through a 1k series resistor.

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