19-4774; Rev 1; 4/99
+3.3V, 622Mbps, SDH/SONET 8:1 Serializer
with Clock Synthesis and TTL Inputs
General Description
The MAX3690 serializer is ideal for converting 8-bit-
wide, 77Mbps parallel data to 622Mbps serial data in
ATM and SDH/SONET applications. Operating from a
single +3.3V supply, this device accepts TTL clock and
data inputs, and delivers a 3.3V differential PECL serial-
data output. A fully integrated PLL synthesizes an inter-
nal 622MHz serial clock from a low-speed crystal
reference clock (77.76MHz, 51.84MHz, or 38.88MHz).
The MAX3690 is available in the extended-industrial
temperature range (-40°C to +85°C) in a 32-pin TQFP
package.
____________________________Features
o
Selectable Reference Clock Frequency:
77.76MHz, 51.84MHz, or 38.88MHz
o
Single +3.3V Supply
o
77Mbps (8-bit) Parallel to 622Mbps Serial
Conversion
o
Clock Synthesis for 622Mbps Serial Data
o
200mW Power
o
TTL Parallel Clock and Data Inputs
o
Differential 3.3V PECL Serial-Data Output
MAX3690
________________________Applications
622Mbps SDH/SONET Transmission Systems
622Mbps ATM/SONET Access Nodes
Add/Drop Multiplexers
Digital Cross Connects
PART
MAX3690ECJ
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
32 TQFP
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
38.88MHz TTL CRYSTAL
REFERENCE
V
CC
= +3.3V
PCLKI
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
PCLKO
RCLK
V
CC
CKSET
1µF
1µF
OVERHEAD
GENERATION
MAX3690
FIL+
FIL-
GND
SD-
SD+
V
CC
= +3.3V
130Ω
130Ω
V
CC
= +3.3V
MAX3668
82Ω
THIS SYMBOL REPRESENTS A TRANSMISSION LINE
OF CHARACTERISTIC IMPEDANCE (Z
0
= 50Ω).
82Ω
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
