Philips Semiconductors

Product specification

SA5214

Postamplifier with link status indicator

2

1998 Oct 07

853-1657 20142

DESCRIPTION

The SA5214 is a 75MHz postamplifier system designed to accept

low level high-speed signals. These signals are converted into a

TTL level at the output. The SA5214 can be DC coupled with the

previous transimpedance stage using SA5210, SA5211 or SA5212

transimpedance amplifiers. This “system on a chip” features an

auto-zeroed first stage with noise shaping, a symmetrical limiting

second stage, and a matched rise/fall time TTL output buffer. The

system is user-configurable to provide noise filtering, adjustable

input thresholds and hysteresis. The threshold capability allows the

user to maximize signal-to-noise ratio, insuring a low Bit Error Rate

(BER). An Auto-Zero loop can be used to minimize the number of

external coupling capacitors to one. A signal absent flag indicates

when signals are below threshold. Additionally, the low signal

condition forces the overall TTL output to a logical Low level. User

interaction with this “jamming” system is available. The SA5214 is

packaged in a standard 20-pin surface-mount package and typically

consumes 42mA from a standard 5V supply. The SA5214 is

designed as a companion to the SA5211/5212 transimpedance

amplifiers. These differential preamplifiers may be directly coupled

to the post-amplifier inputs. The SA5212/5214 or SA5211/5214

combinations convert nanoamps of photodetector current into

standard digital TTL levels.

APPLICATIONS

with high EMI/RFI

PIN CONFIGURATION

GNDA

GNDD

THRESH

IN1B

JAM

VCCD

VCCA

RPKDET

RHYST

OUT1A

TOP VIEW

1

2

3

4

5

6

7

8

9

10

11

12

13

14

20

19

18

17

16

15

VOUT

FLAG

LED

CPKDET

IN1A

CAZP

CAZN

OUT1B

IN2B

IN2A

NOTE:

1. SOL – Released in large SO package only.

SD00349

Figure 1. Pin Configuration

FEATURES

ORDERING INFORMATION

DESCRIPTION

TEMPERATURE RANGE

ORDER CODE

DWG #

20-Pin Plastic Small Outline Large (SOL) Package

-40

°C to +85°C

SA5214D

SOT163-1

ABSOLUTE MAXIMUM RATINGS

SYMBOL

PARAMETER

RATING

UNIT

Power supply

+6

V

Power supply

+6

V

Operating ambient temperature range

-40 to +85

°C

Operating junction temperature range

-55 to +150

°C

Storage temperature range

-65 to +150

°C

Power dissipation

300

mW

Jam input voltage

-0.5 to 5.5

V