LTC2057 datasheet(20/32 Pages) LINER

20 / 32 page

LTC2057/LTC2057HV

2057f

For more information www.linear.com/LTC2057

applicaTions inForMaTion

Figure 7a. Example Layout of Non-Inverting Amplifier with Leakage Guard Ring

LEAKAGE

CURRENT

HIGH-Z

SENSOR

GUARD

RING

NO SOLDER MASK

OVER GUARD RING

V–

GRD

+IN

GRD

–IN

OUT

V+

VOUT

SDCOM

* NO LEAKAGE CURRENT. V+IN = VGRD

** VERROR = ILEAK • RG; RG << ZSENSOR

VBIAS

RG**

2057 F07a

–

RIN

HIGH-Z SENSOR

GUARD RING

† LEAKAGE CURRENT

ALTERNATIVE

GUARD RING

DRIVE

ALTERNATIVE GUARD RING

DRIVE CIRCUIT IF RG MUST

BE HIGH IMPEDANCE.

†

VIN

VOUT

VBIAS

LTC2057

R´F

–

V+

V–

R´G

= R'F

R'G

; R'G <<RG

LTC2057

MS10

Figure 6. Techniques for Minimizing Thermocouple-Induced Errors

LTC2057

THERMAL

GRADIENT

RELAY

MATCHING RELAY

* CUT SLOTS IN PCB FOR THERMAL ISOLATION.

** INTRODUCE DUMMY JUNCTIONS AND COMPONENTS TO OFFSET UNAVOIDABLE JUNCTIONS OR CANCEL THERMAL EMFs.

† ALIGN INPUTS SYMMETRICALLY WITH RESPECT TO THERMAL GRADIENTS.

‡ INTRODUCE DUMMY TRACES AND COMPONENTS FOR SYMMETRICAL THERMAL HEAT SINKING.

§ LOADS AND FEEDBACK CAN DISSIPATE POWER AND GENERATE THERMAL GRADIENTS. BE AWARE OF THEIR THERMAL EFFECTS.

# COVER CIRCUIT TO PREVENT AIR CURRENTS FROM CREATING THERMAL GRADIENTS.

HEAT SOURCE/

POWER DISSIPATOR

RL§

–IN

+IN

RF§

VIN

2057 F06

†

‡

–

VTHERMAL

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