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AZ88923
High-Speed Limiting Post Amplifier
1630 S. STAPLEY DR., SUITE 125 • MESA, ARIZONA 85204 • USA • (480) 962-5881 • FAX (480) 890-2541
www.azmicrotek.com
ARIZONA MICROTEK, INC.
FEATURES
• Up to 2.5Gbps operation
• Differential PECL Inputs
• Differential PECL Outputs
• Open Drain TTL/CMOS LOS Output
• TTL/CMOS Enable Input
• High-Speed SiGe Process
DESCRIPTION
The AZ88923 is a limiting post amplifier usable at data rates up to 2.5Gbps. It is ideal for use as a post
amplifier following a transimpedance amplifier.
The AZ88923 contains a programmable loss of signal detect function to determine when the input signal has
been lost. This information can be used with the /EN input pin to disable the output under LOS conditions. The
detect threshold can be set with a resistor divider between V
CC
and V
REF
. The LOS output is an open drain
compatible with CMOS and TTL.
The outputs produce standard PECL 100K voltage compensated levels.
BLOCK DIAGRAM
D
IN
/D
IN
D
OUT
/D
OUT
/EN
LOS
LOS
LVL
V
REF
PACKAGE AVAILABILITY
PACKAGE PART NO. MARKING
TSSOP 10 AZ88923T AZ88923
TSSOP 10 T&R AZ88923TR1 AZ88923
TSSOP 10 T&R AZ88923TR2 AZ88923
/EN
D
IN
/D
IN
LOS
LVL
V
REF
V
CC
D
OUT
/D
OUT
GND
1
3
2
4
5
TSSOP-10
10
8
9
76LOS
PINOUT ASSIGNMENT
PIN DESCRIPTION
PIN FUNCTION
DIN, /DIN Differential Inputs
D
OUT
, /D
OUT
PECL Outputs
/EN Output Enable
LOS
LVL
LOS Threshold
LOS LOS Output
V
REF
Reference Voltage Output
VCC Positive Voltage
GND Ground
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Absolute Maximum Ratings are those values beyond which device life may be impaired.
Symbol Parameter Value Unit
VCC DC Supply Voltage (Referenced to GND) 4.5 V
TA Operating Temperature Range (In Free-Air) -40 to +85
°C
T
STG
Storage Temperature Range -65 to +150
°C
DIN, /DIN Input Voltage 0 to VCC V
/EN Input Voltage 0 to VCC V
LOS
LVL
Input Voltage 0 to VCC V
V
REF
Output Voltage VCC-2V to VCC V
D
OUT
, /D
OUT
Output Voltage VCC-2V to VCC V
DC Characteristics (V
CC
= 3.0V to 3.6V, R
LOAD
= 50Ω to VCC-2V)
-40°C 0°C 25°C 85°C
Symbol Characteristic
Min Max Min Max Min Typ Max Min Max
Unit
IEE Power Supply Current1 40 40 30 40 45 mA
VOH Output HIGH Voltage
V
CC
-
1085
VCC-
880
VCC1025
VCC-
880
VCC1025
VCC-
955
VCC-
880
VCC1025
VCC-
880
mV
VOL Output LOW Voltage
V
CC
-
1830
VCC1555
VCC1810
VCC1620
VCC1810
VCC1705
VCC1620
VCC1810
VCC1620
mV
VIH
/EN Input HIGH
Voltage
2.0 2.0 2.0 2.0 mV
VIL
/EN Input LOW
Voltage
0.8 0.8 0.8 0.8 mV
VOL
LOS Output LOW
Voltage
2
0.5 0.5 0.5 0.5 V
V
REF
Reference Voltage V
CC
-
1.38
VCC-
1.26
VCC-
1.38
VCC-
1.26
VCC-
1.38
V
CC
-
1.26
VCC-
1.38
VCC-
1.26
V
IIH
/EN Input HIGH
Current
100 100 100 100
µA
V
CMR
Common Mode Range GND+2 VCC GND+2 VCC GND+2 VCC GND+2 VCC V
1. No output load.
2. I
OL
= +2mA.
AC Characteristics (V
CC
= 3.0V to 3.6V, R
LOAD
= 50Ω to VCC-2V)
-40°C 0°C 25°C 85°C
Symbol Characteristic
Min Max Min Max Min Typ Max Min Max
Unit
VID Input Voltage Range 5 1800 5 1800 5 1800 5 1800 mV
tr / tf Rise/Fall Time 150 150 150 150 ps
VOD
Diff V
ID
=15 mVp-p
Out V
ID
=5 mVp-p
600
200
MVp-p
HYS LOS Hysteresis 2 8 2 8 2 4.6 8 2 8 dB
t
OFFL
LOS Release Time
Minimum Input
0.5 0.5 0.1 0.5 0.5
µs
t
OFFH
LOS Release Time
Maximum Input
0.5 0.5 0.1 0.5 0.5
µs
t
ONL
LOS Assert Time 0.5 0.5 0.2 0.5 0.5
µs
VSR LOS Sensitivity Range 5 50 5 50 5 50 5 50 MVp-p
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DIFFERENTIAL INPUT CONFIGURATION
LOS
LVL
V
REF
V
CC
R1
R2
0.1µF
F0.1µ
D
IN
/D
IN
V
REF
F0.1µ
50Ω 50Ω
LOS
LVL
CIRCUIT
NOTES:
LOS
LVL
= VCC – 1.32V +
R1 + R2 ≥ 2.6kΩ
R2 x 1.32V
R1 + R2
LOS
V
CC
>
4.7kΩ
LOS OUTPUT
{
FROM
TRANSIMPEDANCE
AMPLIFIER
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AZ88923
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PACKAGE DIAGRAM
TSSOP 10
MILLIMETERS
DIM
MIN MAX
A
1.10
A1
0.05 0.15
A2
0.80 0.95
A3
0.25
bp
0.15 0.30
c
0.15 0.23
D1
2.90 3.10
E2
2.90 3.10
e
0.50
HE
4.80 5.00
L
0.95
Lp
0.40 0.70
v
0.10
w
0.10
y
0.10
Z
0.34 0.67
θ
0
O
6
O
N
OTES:
1. DIMENSIONS D AND E DO NOT
INCLUDE MOLD PROTRUSION.
2. MAXIMUM MOLD PROTRUSION
FOR D IS 0.15mm.
3. MAXIMUM MOLD PROTRUSION
FOR E IS 0.25mm.
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Arizona Microtek, Inc. reserves the right to change circuitry and specifications at any time without prior notice. Arizona Microtek, Inc.
makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Arizona
Microtek, Inc. assume any liability arising out of the application or use of any product or circuit and specifically disclaims any and all
liability, including without limitation special, consequential or incidental damages. Arizona Microtek, Inc. does not convey any license
rights nor the rights of others. Arizona Microtek, Inc. products are not designed, intended or authorized for use as components in systems
intended to support or sustain life, or for any other application in which the failure of the Arizona Microtek, Inc. product could create a
situation where personal injury or death may occur. Should Buyer purchase or use Arizona Microtek, Inc. products for any such
unintended or unauthorized application, Buyer shall indemnify and hold Arizona Microtek, Inc. and its officers, employees, subsidiaries,
affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly
or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges tha
t
Arizona Microtek, Inc. was negligent regarding the design or manufacture of the part.
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