Patent ID: 8878570

Claim:
An integrated circuit comprising: a configurable interface comprising: a first terminal of the integrated circuit configured to receive a received signal; an operational amplifier; a programmable gain amplifier, an input offset voltage of the programmable gain amplifier being at least two orders of magnitude less than an input offset voltage of the operational amplifier; an attenuator circuit coupled to an output of the operational amplifier and selectively coupled to an input of the programmable gain amplifier; an analog-to-digital converter; a first select circuit configured to selectively couple the operational amplifier to the analog-to-digital converter in response to a first control signal, the first select circuit further configured to selectively couple the programmable gain amplifier to the analog-to-digital converter in response to the first control signal, a second select circuit configured to selectively couple an input of the operational amplifier to receive a signal on an inverting terminal of the operational amplifier in response to a second control signal; and a third select circuit configured to selectively provide a signal to an input of the programmable gain amplifier in response to a third control signal, wherein in a first mode of the configurable interface, the first control signal configures the first select circuit to couple the programmable gain amplifier to the analog-to-digital converter, wherein in a second mode of the configurable interface, the first control signal configures the first select circuit to couple the operational amplifier to the analog-to-digital converter, and wherein in a third mode of the configurable interface, the first control signal configures the first select circuit to couple the programmable gain amplifier to the analog-to-digital converter and the third control signal configures the third select circuit to couple an output of the operational amplifier to the input of the programmable gain amplifier via the attenuator circuit.