8.2.2.3 Differential to Single-Ended Output Conversion

Figure 8-3 shows an example of a TLV6001-based signal conversion and filter circuit for systems using single-

ended-input ADCs to convert the analog output voltage into digital. With R1 = R2 = R3 = R4, the output voltage

system. For most applications, R1 = R2 = R3 = R4 = 3.3 kΩ and C1 = C2 = 330 pF yields good performance.

10

10

10 nF

VDD1

GND1

INP

INN

AMC1202

VDD2

OUTP

OUTN

GND2

Figure 8-3. Connecting the AMC1202 Output to a Single-Ended Input ADC

For more information on the general procedure to design the filtering and driving stages of SAR ADCs, see

the 18-Bit, 1MSPS Data Acquisition Block (DAQ) Optimized for Lowest Distortion and Noise and 18-Bit Data

Acquisition Block (DAQ) Optimized for Lowest Power reference guides, available for download at www.ti.com.

8.2.3 Application Curve

One important aspect of power-stage design is the effective detection of an overcurrent condition to protect the

switching devices and passive components from damage. To power off the system quickly in the event of an

overcurrent condition, a low delay caused by the isolated amplifier is required. Step Response of the AMC1202

shows the typical full-scale step response of the AMC1202.

VOUTN

VIN

VOUTP

Figure 8-4. Step Response of the AMC1202

8.2.4 What to Do and What Not to Do

Do not leave the inputs of the AMC1202 unconnected (floating) when the device is powered up. If the device

inputs are left floating, the input bias current may drive the inputs to a positive value that exceeds the operating

common-mode input voltage and the device outputs the fail-safe voltage as described in the Analog Output

section.

Connect the high-side ground (GND1) to INN, either by a hard short or through a resistive path. A DC current

path between INN and GND1 is required to define the input common-mode voltage. Do not exceed the input

common-mode range as specified in the Recommended Operating Conditions table. For best accuracy, route

the ground connection as a separate trace that connects directly to the shunt resistor rather than shorting GND1

to INN directly at the input to the device. See the Layout section for more details.

AMC1202

SBASAB8 – MAY 2021

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