TSU111 datasheet(21/30 Pages) STMICROELECTRONICS

tên linh kiện	TSU111

Giải thích chi tiết về linh kiện	Nanopower (900 nA), high accuracy (150 µV) 5 V CMOS operational amplifier

PDF	30 Pages

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TSU111

Application information

DocID029790 Rev 2

21/30

Figure 35: Potentiostat schematic using the TSU111

5.6

Fast desaturation

When the TSU111 goes into saturation mode, it takes a short period of time to recover,

typically 630 µs. When recovering after saturation, the TSU111 does not exhibit any

voltage peaks that could generate issues (such as false alarms) in the application

(see Figure 14).

We can observe that this circuit still exhibits good gain even close to the rails i.e. Avd

greater than 105 dB for Vcc = 3.3 V with Vout varying from 200 mV up to a supply voltage

minus 200 mV. With a trans-impedance schematic, a voltage reference can be used to

keep the signal away from the supply rails.

5.7

Using the TSU111 in comparator mode

The TSU111 can be used as a comparator. In this case, the output stage of the device

always operates in saturation mode. In addition, Figure 3 shows that the current

consumption is not higher and even decreases smoothly close to the rails. The TSU111 is

obviously an operational amplifier and is therefore optimized for use in linear mode. We

recommend using the TS88 series of nanopower comparators if the primary function is to

perform a signal comparison only.

TSU111

V ref2

TSU111

V ref1

TSU111 bảng dữ liệu(PDF) 21 Page - STMicroelectronics