HDMP-1638 Datasheet, PDF (10/19 Pages) Agilent(Hewlett-Packard) – Gigabit Ethernet Transceiver Chip with Dual Serial I/O and Differential PECL Clock Inputs

10
HDMP-1638 (Transmitter Section)
Output Jitter Characteristics
(Measured with equivalent parts which have TTL REFCLK input)
T_A = 0 °C to +70 °C, V_CC = 3.15 V to 3.45 V
Symbol
Parameter
RJ^[1]
Random Jitter at DOUT, the High Speed Electrical Data Port, Specified as
1 Sigma Deviation of the 50% Crossing Point (RMS)
DJ^[1] Deterministic Jitter at DOUT, the High Speed Electrical Data Port (pk-pk)
Units Typ.
ps
8
ps TBD
Note:
1. Defined by Fibre Channel Specification X3.230-1994 FC-PH Standard, Annex A, Section A.4 and tested using measurement method
shown in Figure 8.
70841B
PATTERN
GENERATOR*
83480A
OSCILLOSCOPE
0000011111 + DATA
- DATA
125 MHz
1.25 GHz
TRIGGER
CH1 CH2
70311A
CLOCK SOURCE
* PATTERN
GENERATOR
PROVIDES A
DIVIDE BY
10 FUNCTION.
BIAS
TEE
+DOUT -DOUT
HDMP-1638
REFCLK LOOPEN
Tx[0..9]
1.4 V
0011111000
(STATIC K28.7)
A. BLOCK DIAGRAM OF RJ MEASUREMENT METHOD
Figure 8: Transmitter Jitter Measurement Method.
70311A
CLOCK SOURCE
DIVIDE
BY 10
CIRCUIT
(DUAL
OUTPUT)
1.25 GHz
DIVIDE
BY 2
CIRCUIT
70841B
PATTERN
GENERATOR
+K28.5, -K28.5 + DATA
- DATA
83480A
OSCILLOSCOPE
TRIGGER
CH1 CH2
VARIABLE
DELAY
TTL
125 MHz
+DOUT -DOUT
-DIN
+DIN
HDMP-1638
REFCLK
ENBYTSYNC
LOOPEN
Tx[0..9] Rx[0..9]
B. BLOCK DIAGRAM OF DJ MEASUREMENT METHOD