ANADIGICS ATA7602D1

ATA7602
10GB/s Offset Control TIA
Advanced Product Information - Rev 0
FEATURES
·
Differential Output Topology
·
DC Output Offset Control (external loop)
·
Low Group Delay
·
DC Coupled Outputs
·
-5.2V Power Supply
·
InGaP HBT Technology
APPLICATIONS
·
SONET OC-192/STM-64
·
10Gb/s DWDM
·
10Gb/s Datacom
D1 Package
PRODUCT DESCRIPTION
The ANADIGICS ATA7602 is a -5.2V high speed
transimpedance amplifier (TIA) for 10Gb/s
applications available in bare die form and
manufactured using an InGaP HBT process. The
device is used in conjunction with a photodetector to
convert an optical signal into a differential voltage
that can be AC or DC coupled to a post amplifier.
The DC offset between the two outputs can be adjusted
in order to maintain low dury cycle distortion for large
signal operation or to provide an adjustable decision
threshold for the post amplifier.
Figure 1: Block Diagram
ATA7602
Absolute Maximum Ratings
PAR AMETER
MIN
TYP
MAX
U N IT
V
D C Power supply (VEE)
-7.0
1.0
Storage Temperature
-65
125
D C Input C urrent
o
C
3.0
mA
Operating Conditions
PAR AMETER
Operati ng Voltage Range
Operati ng Temperature Range
MIN
TYP
MAX
U N IT
-5.50
-5.2
-4.90
V
-40
85
o
Photodi ode C apaci tance (PIN + stray)
0.3
pF
Seri es Resi stance (Bondwi re + anode)
15
W
Bondwi re Inductance
1.0
nH
C
DC Characteristics
PAR AMETER
2
MIN
TYP
MAX
U N IT
Supply C urrent (D C C oupled)
115
155
mA
Input D C Voltage
-3.9
V
Output D C Voltage
-0.4
V
Advanced Product Information - Revision 0
03/01
ATA7602
AC Electrical Characteristics (VEE=-5.2V+/-0.3V, CDIODE+CSTRAY=0.3PF, LBOND=0.7nH)
PAR AMETER
MIN
TYP
Small Si gnal D i fferenti al Transi mpedance (RL = 100 W )
2000
2200
Maxi mum Output Voltage Swi ng (RL = 50 W )
600
700
Input C urrent @ 80% Output Saturati on
550
Bandwi dth (-3dB; Iinput <= 1.65mApk-pk)
8.5
Low Frequency C utoff (1)(4)
Group D elay D evi ati on (30kHz to 8.0GHz)
Group D elay D evi ati on (30kHz to Fc)
(1)
(1)
Output Return Loss (10MHz to Fc)
W
800
mVpp
m A pp
9.5
GHz
30
kHz
+15
ps
-25
+25
ps
-19
dB m
0
dB m
-15
Output Return Loss (FC to 20GHz)
(1)
(2)
(3)
(4)
(5)
U N IT
-15
Opti cal Sensi ti vi ty (wi th a PIN Photodi ode) (2)(3)(4)(5)
Opti cal Overload (wi th a PIN Photodi ode) (2)(3)(4)
MAX
-12
dB
-5
dB
Optical input power = -19 to 0dBm, Fc = 9.5GHz
Responsivity of the photodiode = 0.95A/W typical, laser extinction ratio=10dB
-10
BER: 10 ; 9.95328Gbps NRZ pattern; PRBS 231-1, l=1.55mm
External 1nF Capacitor Required (Cext: see figure 3)
Measurements made in reference fixture with open cavity
fiber alignment. Improvements in coupling will result in better performance.
Advanced Product Information - Revision 0
03/01
3
ATA7602
Pad Description
PAD
D escription
C omment
V E E 1, V E E
Negati ve Supply Voltage
-5.2V
RFIN
TIA Input
C onnect to detector anode
D C OUT
Non-i nverted D C Output Voltage
Feeds i nto External Op-amp
for Offset control
D C OUTB
Inverted D C Output Voltage
Feeds i nto External Op-amp
for Offset control
VCTRL
Offset C ontrol
Use to set relati ve D C offset
between the output ports
C EXT
Pad for bondi ng external capaci tor to ground i n C hoose C apaci tor usi ng the
order to set low freq. C utoff)
attached chart
OUT
TIA Output Voltage (Non-i nverted)
Logi cal '1' wi th opti cal i nput
OUTB
TIA Output Voltage (Inverted)
Logi cal '0' wi th opti cal i nput
Figure 2: Die Size and layout
Die Size: 1075m m x 950 m m
4
Advanced Product Information - Revision 0
03/01
ATA7602
Figure 3: Calculated External Capacitor Size vs. Low Frequency Cutoff
Required Cext (pF)
10000
1000
100
10
0
50
100
150
200
250
300
350
400
16
18
Low Cutoff Frequency (kHz)
Figure 4: Simulated Bandwidth
70
dB(Z(2,1))
60
50
40
30
0
2
4
6
8
10
12
14
20
freq, GHz
Advanced Product Information - Revision 0
03/01
5
ATA7602
Figure 5: Simulated Group Delay
1.6E-10
Z.delay(2,1)
1.4E-10
m1
freq=3.748GHz
Z. delay(2,1)=7.859E-11
1.2E-10
m2
m2
freq=2.985E9
Z.delay(2,1)=2.981E-11
delta mode ON
1.0E-10
m1
8.0E-11
6.0E-11
0
2
4
6
8
10
12
14
16
18
20
freq, GHz
Figure 6: Simulated Bandwidth and Group Delay vs. Input Inductance
11.2
19.0
11.0
18.0
17.5
10.8
17.0
16.5
10.6
16.0
15.5
10.4
15.0
14.5
14.0
10.2
0.4
0.5
0.6
0.7
0.8
0.9
1
Input Inductance (nH)
6
Advanced Product Information - Revision 0
03/01
1.1
Bandwidth (GHz)
Group Delay (+/- psec)
18.5
ATA7602
Figure 7: Simulated Output Return Loss
0
-10
dB
-20
-30
-40
-50
-60
0
2
4
6
8
10
12
14
16
18
20
freq, GHz
Ordering Information
Part N umber
ATA7602D 1
Package Option
D1
Package D escription
Die
Advanced Product Information - Revision 0
03/01
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ATA7602
ANADIGICS, Inc.
141 Mount Bethel Road
Warren, New Jersey 07059, U.S.A
Tel: +1 (908) 668-5000
Fax: +1 (908) 668-5132
http://www.anadigics.com
Mktg@anadigics.com
IMPORTANT NOTICE
ANADIGICS, Inc. reserves the right to make changes to its products or discontinue any product at any time without notice.
The Advanced Product data sheets and product specifications contained in this data sheet are subject to change prior to
a products formal introduction. The information in this data sheet has been carefully checked and is assumed to be reliable.
However, ANADIGICS assumes no responsibility for inaccuracies. ANADIGICS strongly urges customers to verify that the
information they are using is current before placing orders.
WARNING
ANADIGICS products are not intended for use in life support appliances, devices, or systems. Use of an ANADIGICS
product in any such application without written consent is prohibited.
Preliminary Data Sheet - Revision 1
03/01
8