SA5214D/01,112 NXP Semiconductors, SA5214D/01,112 Datasheet - Page 7

• Manufacturer Part Number: SA5214D/01,112
• Description: IC POSTAMP STATUS IND 20-SOIC
• Manufacturer: NXP Semiconductors
• Type: Postamplifierr

Specifications of SA5214D/01,112

• Applications: Optical Networks
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935275246112; SA5214D/01; SA5214D/01

Philips Semiconductors
THEORY OF OPERATION AND APPLICATION
INFORMATION
The SA5214 postamplifier system is a highly integrated chip that
provides up to 60dB of gain at 60MHz, to bring mV level signals up
to TTL levels.
The SA5214 contains eight amplifier blocks (see Block Diagram).
The main signal path is made up of a cascade of limiting stages: A1,
A2 and A8. The A3-A4-A7 path performs a wideband full-wave
rectification of the input signal with adjustable hysteresis and decay
times. It outputs a TTL HIGH on the “FLAG” output (Pin 5) when the
input is below a user adjustable threshold. An on-chip LED driver
turns the external LED to the ON state when the input signal is
above the threshold. In a typical application the “FLAG” output is tied
back to the “JAM” input; this forces the TTL data OUT into a LOW
state when no signal is present at the input.
An auto zero loop allows the SA5214 to be directly connected to a
transimpedance amplifier such as the SA5210, SA5211, or SA5212
without coupling capacitors. This auto-zero loop cancels the
transimpedance amplifier’s DC offset, the SA5214 A1 offset, and the
data-dependent offset in the PIN diode/transimpedance amplifier
combination. For more information on the SA5214 Theory of
1998 Oct 07
Postamplifier with link status indicator
10 H
NOTE:
The NE5211/NE5214 combination can operate at data rates in excess of 100Mb/s NRZ.
L3
10 H
L2
C10
10 F
C12
10 F
220
R2
.01 F
C9
R3
47k
C11
.01 F
100pF
LED
C13
D1
V
OUT
(TTL)
10
1
2
3
4
5
6
7
8
9
THRESH
LED
C
GND
FLAG
JAM
V
V
GND
TTL
CCD
CCA
PKDET
OUT
A
D
Figure 5. A 50Mb/s Fiber Optic Receiver
R
R
PKDET
OUT
OUT
C
C
HYST
IN
IN
IN
IN
AZP
AZN
C1
C2
1B
1A
1B
1A
2B
2A
+V
18
16
CC
20
19
17
15
14
13
12
11
C7
47 F
.01 F
0.1 F
C8
100pF
R4
5.1k
7
Operation, please refer to paper titled “A Low Cost 100 MBaud
Fiber-Optic Receiver” by W. Mack et al.
A typical application of the SA5214 postamplifier is depicted in
Figure 5. The system uses the SA5211 transimpedance amplifier
which has a 28k differential transimpedance gain and a -3dB
bandwidth of 140MHz. This typical application is optimized for a 50
Mb/s Non Return to Zero (NRZ) bit stream.
As the system’s gain bandwidth product is very high, it is crucial to
employ good RF design and printed circuit board layout techniques
to prevent the system from becoming unstable.
For more information on this application, please refer to AB 1432.
Die Sales Disclaimer
Due to the limitations in testing high frequency and other parameters
at the die level, and the fact that die electrical characteristics may
shift after packaging, die electrical parameters are not specified and
die are not guaranteed to meet electrical characteristics (including
temperature range) as noted in this data sheet which is intended
only to specify electrical characteristics for a packaged device.
GND
10
11
12
13
14
8
9
GND
GND
GND
GND
OUT
GND
OUT
GND
GND
V
V
I
CC
CC
NC
NC
IN
1
7
6
5
4
3
2
.01 F
C4
10 H
L1
Product specification
SA5214
10 F
R1
100
C3
OPTICAL
BPF31
INPUT
SD00353
1.0 F
.01 F
C5
C6