Philips Semiconductors Linear Products
Product specification
Sample-and-hold amplifier
NE/SE5537
DESCRIPTION
The NE5...
Philips Semiconductors Linear Products
Product specification
Sample-and-hold amplifier
NE/SE5537
DESCRIPTION
The NE5537 monolithic sample-and-hold amplifier combines the best features of ion-implanted JFETs with bipolar devices to obtain high accuracy, fast acquisition time, and low droop rate. This device is pin-compatible with the LF198, and features superior performance in droop rate and output drive capability. The circuit shown in Figure 1 contains two operational
amplifiers which function as a unity gain amplifier in the sample mode. The first amplifier has bipolar input transistors which give the system a low offset
voltage. The second amplifier has JFET input transistors to achieve low leakage current from the hold capacitor. A unique circuit design for leakage current cancellation using current mirrors gives the NE5537 a low droop rate at higher temperature. The output stage has the capability to drive a 2kΩ load. The logic input is compatible with TTL, PMOS or
CMOS logic. The differential logic threshold is 1.4V with the sample mode occurring when the logic input is high. It is available in 8-lead TO-5, 8-pin plastic DIP packages, and 14-pin SO packages.
PIN CONFIGURATIONS
FE and N Packages
V+ 1 OFFSET ADJUST 2 INPUT 3 V– 4 8 7 6 5 LOGIC LOGIC REFERENCE Ch OUTPUT
D1 Package
INPUT NC V– NC NC 1 2 3 4 5 6 7 14 V OS ADJ 13 NC 12 V+ 11 LOGIC 10 LOGIC REFERENCE 9 8 NC Ch
FEATURES
NC OUTPUT
Operates from ±5V to ±18V supplies Hold leakage current 6pA @ TJ = 25...