tza3015hw NXP Semiconductors, tza3015hw Datasheet - Page 9

• Manufacturer Part Number: tza3015hw
• Description: 30 Mbit/s To 3.2 Gbit/s A-rate 4-bit Fibre Optic Transceiver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 3 Truth table for pins DR2 to DR0 (pin UI = V
Receiver
L
The TZA3015HW contains a limiting amplifier (see Fig.3).
To achieve optimum receiver sensitivity for any bit rate, the
bandwidth of the amplifier is automatically scaled with the
bit rate. Wideband noise of the optical front-end (photo
detector and transimpedance amplifier) is thus reduced for
lower bit rates. When using the I
the amplifier can be set independently of the bit rate with
bits AMP[2:0] in register LIMCON (D3h).
The highest bandwidth is selected as default at power-up.
2003 Dec 16
handbook, full pagewidth
LOW
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
IMITING AMPLIFIER
DR2
30 Mbit/s to 3.2 Gbit/s A-rate
4-bit fibre optic transceiver
LOW
LOW
HIGH
HIGH
LOW
LOW
HIGH
HIGH
DR1
LOW
HIGH
LOW
HIGH
LOW
HIGH
LOW
HIGH
V RSSI
DR0
(V)
0.68
1.2
0.9
0.6
0.3
0
STM1/OC3
STM4/OC12
STM16/OC48 2488.32
STM16 + FEC 2666.06
GE
10GE
Fibre Channel 1062.50
Fibre Channel 2125.00
PROTOCOL
5
2
C-bus, the bandwidth of
10
Fig.4 V
155.52
622.08
1250.00
3125.00
BIT RATE
(Mbit/s)
32
RSSI
EE
as a function of V
)
9
Received Signal Strength Indicator (RSSI)
The signal strength at the input is measured with a
logarithmic detector. The logarithmic detector converts the
input signal amplitude into a voltage which can be
measured at pin RSSI. The RSSI reading has a dynamic
range of 40 dB with a sensitivity (S
(typical) for a V
can be calculated using the following formula:
where: V
V
handbook, halfpage
RSSI
10
2
Fig.3 Limiter input termination configuration.
=
RSSI(32mV)
V
RSSI(32mV)
i(p-p)
IN
INQ
i(p-p)
.
300
range of 5 to 500 mV (see Fig.4). V
= 680 mV (typical).
V CCA
S RSSI
V EE
+
S
RSSI
V i(p-p) (mV)
500
20log
MCE412
Preliminary specification
10
RSSI
TZA3015HW
MDB385
3
---------------- -
32 mV
50
50
V
) of 17 mV/dB
i(p-p)
RSSI