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부품번호 | TZA3013BU 기능 |
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기능 | SDH/SONET STM16/OC48 transimpedance amplifier | ||
제조업체 | NXP Semiconductors | ||
로고 | |||
INTEGRATED CIRCUITS
DATA SHEET
TZA3013A; TZA3013B
SDH/SONET STM16/OC48
transimpedance amplifier
Product specification
Supersedes data of 2000 Jun 19
File under Integrated Circuits, IC19
2001 Feb 26
Philips Semiconductors
SDH/SONET STM16/OC48
transimpedance amplifier
Product specification
TZA3013A; TZA3013B
PINNING
SYMBOL
PAD
PAD
TZA3013AU TZA3013BU
TYPE
DESCRIPTION
DREF
IN
INQ
AGC
OUTQSENSE
OUTQ
GNDA
GNDA
TESTC
GNDD
TESTD
PILOT
OUT
OUTSENSE
VCC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1 analog bias voltage output for PIN diode; connect cathode of
output PIN diode to this pad
2 input current input; anode of PIN diode should be connected to
this pad; note 1
3 input decision level adjust input; note 1
4 analog AGC voltage
output
14 analog data sense output for OUTQ; for test purposes
output
13 output data output; compliment of OUT
7 ground analog ground
8 ground analog ground
9 input test input; not used in the application
10 ground digital ground
11 input test input; not used in the application
12 analog pilot tone detection current output
output
6 output data output; compliment of OUTQ; note 2
5 analog data sense output for OUT; for test purposes
output
15 supply supply voltage
Notes
1. DC bias voltage = 0.86 V.
2. This pad goes HIGH when current flows into pad IN.
2001 Feb 26
4
4페이지 Philips Semiconductors
SDH/SONET STM16/OC48
transimpedance amplifier
Product specification
TZA3013A; TZA3013B
AGC
The TZA3013 transimpedance amplifier can handle input
currents from 6 µA to 1.7 mA which is equivalent to a
dynamic range of 49 dB. At low input currents, the
transimpedance must be high to obtain enough output
voltage, and the noise should be low enough to guarantee
a minimum bit error rate. At high input currents however,
the transimpedance should be low to avoid pulse width
distortion. To achieve the wide dynamic range requires the
gain of the amplifier to depend on the level of the input
signal. This is achieved in the TZA3013 by an AGC loop.
The AGC loop comprises a peak detector, a hold capacitor
and a gain control circuit. The peak detector detects the
amplitude of the signal and the hold capacitor stores it. The
hold capacitor voltage is compared to a threshold voltage
which corresponds to an input current of 50 µA (p-p). The
AGC is only active when the input signal level is larger than
the threshold level and is inactive when the input signal is
smaller than the threshold level.
When the AGC is inactive, the transimpedance is at its
maximum value of 4 kΩ differential. When the AGC is
active, the feedback resistor value of the transimpedance
amplifier is reduced, reducing its transimpedance, to keep
the output voltage constant. The transimpedance is
regulated from 4 kΩ at low currents (Ii < 50 µA) to 80 Ω at
high currents (Ii = 1.7mA). The AGC allows the amplifier to
remain linear over the whole input current range compared
to other configurations which clip the large signals, such as
those using Schottky diodes, for example.
The top half of Fig.7 shows the output voltage at pads OUT
and OUTQ (VOUT and VOUTQ) as a function of DC input
current (II) at a supply voltage of 3.3 V. The bottom half of
Fig.7 shows the difference between VOUT and VOUTQ. The
output voltage changes linearly up to an input current of
50 µA. At this point and above, the AGC becomes active
and tries to keep the differential output voltage constant,
which is about 220 mV for a large range input current of
<1.7 mA.
3.2
handbVoook, full pagewidth
(V)
3.1
3.0
2.9
2.8
300
Vo(dif)
(mV)
200
100
0
1
Vo(dif) = VOUT − VOUTQ
2001 Feb 26
VOUT
MGT104
VCC = 3.3 V
VOUTQ
10
102
103
Ii (µA)
104
Fig.7 AGC characteristics.
7
7페이지 | |||
구 성 | 총 16 페이지수 | ||
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부품번호 | 상세설명 및 기능 | 제조사 |
TZA3013B | SDH/SONET STM16/OC48 transimpedance amplifier | NXP Semiconductors |
TZA3013BU | SDH/SONET STM16/OC48 transimpedance amplifier | NXP Semiconductors |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |