MAXIM MAX3658AE/D

19-3015; Rev 1; 5/04
622Mbps, Low-Noise, High-Gain
Transimpedance Preamplifier
The MAX3658 is a transimpedance preamplifier for
receivers operating up to 622Mbps. Low noise, high
gain, and low power dissipation make it ideal for fiber
access and small form-factor transceivers.
The MAX3658 features 45nA input-referred noise, 18kΩ
transimpedance gain, 580MHz bandwidth, and 2mAP-P
input overload. Operating from a +3.3V supply, the
MAX3658 consumes only 66mW. An integrated filter
resistor provides positive bias for the photodiode. These
features, combined with a small die size, allow easy
assembly into a TO-46 header with a photodiode. The
MAX3658 also includes an average photocurrent monitor.
The MAX3658 has typical optical sensitivity of -33dBm
(0.9A/W), which exceeds the class-B APON requirements. Typical optical overload is 1dBm. The MAX3658
is available in die form with both output polarities
(MAX3658A and MAX3658B). The MAX3658A is also
available in a 3mm x 3mm 8-pin TDFN package.
Applications
Features
♦ 45nARMS Noise, -33dBm Sensitivity
♦ 18.3kΩ Transimpedance Gain
♦ 580MHz Bandwidth
♦ 2mAP-P Input Overload, 1dBm Overload
♦ 66mW Power Dissipation
♦ 3.3V Operation
♦ Average Photocurrent Monitor
Ordering Information
PART
TEMP RANGE
PINPACKAGE
PKG
CODE
MAX3658AETA
-40°C to +85°C
8 TDFN
(3mm x 3mm)
T833-1
MAX3658AE/D
—
Dice*
—
MAX3658BE/D
—
Dice*
—
*Dice are designed to operate over a -40°C to +100°C junction
temperature (Tj) range, but are tested and guaranteed at TA =
+25°C.
Optical Receivers (Up to 622Mbps Operation)
Passive Optical Networks
SFF/SFP Transceivers
Pin Configuration appears at end of data sheet.
FTTx Transceivers
Typical Operating Circuit
+3.3V
CVCC1
CVCC2
5-PIN TO-46 HEADER
RFILT
FILT
0.1µF
OUT+
CFILT
25Ω*
75Ω*
MAX3748
IN
COUT*
0.1µF
OUT-
100Ω
25Ω*
75Ω*
LIMITING AMPLIFIER
MAX3658
GND
MON
RMON
*OPTIONAL COMPONENTS
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
MAX3658
General Description
MAX3658
622Mbps, Low-Noise, High-Gain
Transimpedance Preamplifier
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC) ............................................-0.5V to +4.2V
Current into IN ....................................................................+5mA
Voltage at OUT+, OUT- ...................(VCC - 1.2V) to (VCC + 0.5V)
Voltage FILT, MON .....................................-0.5V to (VCC + 0.5V)
Continuous Power Dissipation (TA = +85°C)
8-Lead TDFN (derate 24.4mW/°C above +85°C) ......1951.2mW
Operating Temperature Range ...........................-40°C to +85°C
Operating Junction Temperature Range (die) ....-40°C to +150°C
Storage Temperature Range .............................-55°C to +150°C
Die Attach Temperature...................................................+400°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(VCC = +2.97V to +3.63V, 150Ω load between OUT+ and OUT-, Tj = -40°C to +100°C. Typical values are at VCC = +3.3V and TA =
+25°C, unless otherwise noted.)
PARAMETER
SYMBOL
Supply Current
ICC
Input Bias Voltage
VIN
Transimpedance Linear Range
Small-Signal Transimpedance
Z21
Output Impedance
Maximum Output Voltage
Filter Resistor
MIN
IIN = 1µA
0.95 < linearity < 1.05
Output Common-Mode Voltage
Differential Output Offset
CONDITIONS
IIN < 2µAP-P
MAX
UNITS
20
26
mA
0.83
1.0
4
15.7
18.3
kΩ
V
mV
ZOUT
Single ended
60
75
90
Ω
VOUT(MAX)
IIN = 2mAP-P
150
240
400
mVP-P
RFILT
Offset-Correction Disable
Threshold
IIN = 4µA
15
20
25
kΩ
IIN = 1.3mA
300
500
700
Ω
Voltage applied at FILT
Input Resistance
0.4
FILT = 0V
Nominal MON Current Gain
GMON
MON Output Voltage Range
VMON
MON Accuracy (Note 1)
V
Ω
400
IMON / IIN (IIN = 1mA, 3.3V, +25°C)
0.8
1
1.2
A/A
1µA ≤ IIN < 2µA
0
2.2
V
-2.5
+2.5
2µA ≤ IIN < 5µA
-2
+2
5µA ≤ IIN < 1mA
-1.5
+1.5
Note 1: Accuracy is defined as 10log(IMON / IIN).
2
20.9
±2
IIN = 1.3mA
V
µAP-P
VCC 0.125
AC-coupled output
∆VOUT
TYP
_______________________________________________________________________________________
dB
622Mbps, Low-Noise, High-Gain
Transimpedance Preamplifier
(VCC = +2.97V to +3.63V, 150Ω load between OUT+ and OUT-, CIN = 0.5pF total, CFILT = 400pF, CVCC2 = 1nF, Tj = -40°C to +100°C,
TA = -40°C to +85°C. Typical values are at VCC = +3.3V and TA = +25°C, unless otherwise noted. AC characteristics are guaranteed by
design and characterization.)
PARAMETER
SYMBOL
Bandwidth
BW
Input-Referred Noise
CONDITIONS
(Note 2)
in
MIN
TYP
435
580
MAX
UNITS
55
nARMS
MHz
BW = 467MHz
45
Noise Density
BW = 467MHz
2.1
Low-Frequency Cutoff
IIN = 1µA
30
2µAP-P ≤ IIN < 10µAP-P
150
10µAP-P ≤ IIN < 2mAP-P
260
Deterministic Jitter (Note 3)
DJ
Optical Overload
PIN(MAX)
Optical Sensitivity
PIN(MIN)
1.0A/W photodiode at 622 Mbps
+1
1.0A/W photodiode at 155 Mbps
-7.2
0.9A/W photodiode
-33
pA/√Hz
kHz
psP-P
dBm
dBm
Note 2: -3dB bandwidth is measured relative to the gain at 10MHz.
Note 3: Measured using a pattern equivalent to 223 - 1 PRBS with 72 CIDs at 622Mbps.
Typical Operating Characteristics
(VCC = +3.3V, CIN = 0.5pF, TA = +25°C, unless otherwise noted.)
SMALL-SIGNAL TRANSIMPEDANCE
vs. TEMPERATURE
17
16
MONITOR CURRENT (µA)
18
24
21
18
15
-20
0
20
40
60
AMBIENT TEMPERATURE (°C)
80
100
MAX3658 toc03
100
10
1
0.1
15
-40
1000
MAX3658 toc02
27
SUPPLY CURRENT (mA)
19
TRANSIMPEDANCE (kΩ)
30
MAX3658 toc01
20
MONITOR CURRENT
vs. DC INPUT CURRENT
SUPPLY CURRENT vs. TEMPERATURE
-40
-20
0
20
40
60
AMBIENT TEMPERATURE (°C)
80
100
0.1
1
10
100
1000
DC INPUT CURRENT (µA)
_______________________________________________________________________________________
3
MAX3658
AC ELECTRICAL CHARACTERISTICS
Typical Operating Characteristics (continued)
(VCC = +3.3V, CIN = 0.5pF, TA = +25°C, unless otherwise noted.)
RFILT = 500Ω
1000
800
600
400
55
50
45
40
35
30
200
25
RFILT = 20kΩ
0
1
10
SEE NOTE 3
1000
10,000
1
10
DC INPUT CURRENT (µA)
1
10,000
1000
100
MAX3658 toc08
85
50
1200
1000
BANDWIDTH (MHz)
150
1000
BANDWIDTH vs. INPUT CAPACITANCE
FREQUENCY RESPONSE
TRANSIMPEDANCE (dBΩ)
200
100
10
DC INPUT CURRENT (µA)
90
MAX3658 toc07
250
DIFFERENTIAL OUTPUT VOLTAGE (mVP-P)
10
INPUT CURRENT (µAP-P)
DIFFERENTIAL OUTPUT VOLTAGE
vs. INPUT CURRENT
80
75
70
TEMP = +25°C
800
600
400
200
65
20 log (VOUT / IIN)
0
60
0
0
5
10
15
20
25
1k
30
INPUT CURRENT (µAP-P)
50
40
TEMP = -40°C
TEMP = +25°C
30
20
0.6
0.3
0.6
300
0.9
0.9
INPUT CAPACITANCE (pF)
1.2
1.5
MAX3658 toc12
2µA 231 - 1 PRBS INPUT
AT 622.08Mbps
200
4.8mV/div
150
100
1
10
1.5
OUTPUT EYE DIAGRAM
(2µA ELECTRICAL INPUT)
250
0.1
1.2
INPUT CAPACITANCE (pF)
0
10
0.3
0
10G
50
IIN = 0µA
467MHz BANDWIDTH
0
1G
MAX3658 toc11
TEMP = +110°C
100k 1M 10M 100M
FREQUENCY (Hz)
350
INPUT-REFERRED NOISE (nARMS)
60
MAX3658 toc10
70
10k
INPUT-REFERRED RMS NOISE
vs. DC INPUT CURRENT
INPUT-REFERRED RMS NOISE
vs. INPUT CAPACITANCE
4
100
100
1
20
100
MAX3658 toc06
MAX3658 toc05
60
1000
MAX3658 toc09
1200
65
DETERMINISTIC JITTER (ps)
1400
FILTER VOLTAGE (mV)
70
MAX3658 toc04
1600
SMALL-SIGNAL LOW-FREQUENCY CUTOFF
vs. DC INPUT CURRENT
DETERMINISTIC JITTER
vs. INPUT CURRENT AMPLITUDE
LOW-FREQUENCY CUTOFF (kHz)
FILTER VOLTAGE
vs. DC INPUT CURRENT
INPUT-REFERRED NOISE (nARMS)
MAX3658
622Mbps, Low-Noise, High-Gain
Transimpedance Preamplifier
100
330ps/div
DC INPUT CURRENT (µA)
_______________________________________________________________________________________
622Mbps, Low-Noise, High-Gain
Transimpedance Preamplifier
OUTPUT EYE DIAGRAM
(-28dBm OPTICAL INPUT)
OUTPUT EYE DIAGRAM
(0dBm OPTICAL INPUT)
MAX3658 toc13
MAX3658 toc14
231 - 1 PRBS INPUT AT 622Mbps
231 - 1 PRBS INPUT AT 622Mbps
4.5mV/div
20mV/div
300ps/div
200ps/div
Pin Description
PIN
NAME
1
VCC
FUNCTION
2
IN
3
FILT
Optional Filter Connection. Use to bias the photodiode cathode. An internal on-chip resistive network
is connected between this pin and VCC; an external decoupling capacitor connected to this pin forms
a filter (see the Design Procedure section). Leave this pin open if a filter is not required.
4
MON
Optional Photocurrent Monitor. This is a current output. Connect a resistor between MON and ground
to monitor the average photocurrent. Leave this pin open if a monitor is not required.
5, 8
GND
Circuit Ground
6
OUT+
Positive 75Ω Data Output. Increasing input current causes OUT+ to increase.
7
OUT-
Negative 75Ω Data Output. Increasing input current causes OUT- to decrease.
+3.3V Supply Voltage
Signal Input. Connect to photodiode anode.
_______________________________________________________________________________________
5
MAX3658
Typical Operating Characteristics (continued)
(VCC = +3.3V, CIN = 0.5pF, TA = +25°C, unless otherwise noted.)
622Mbps, Low-Noise, High-Gain
Transimpedance Preamplifier
MAX3658
Functional Diagram
Rf
ROUT
OUT+
IN
VOLTAGE
AMPLIFIER
TIA
OUTPUT
BUFFER
ROUT
OUT-
LOWPASS
FILTER
DC CANCELLATION
EN
VCC
MON
FILT
RESISTIVE
NETWORK
MAX3658
Detailed Description
The MAX3658 transimpedance amplifier is designed for
622Mbps fiber optic applications. The MAX3658 is
comprised of a transimpedance amplifier, a voltage
amplifier, an output buffer, a DC cancellation circuit,
and a photocurrent monitor.
AMPLITUDE
TIME
Transimpedance Amplifier
The signal current at the input flows into the summing
node of a high-gain amplifier. Shunt feedback through
resistor RF converts this current into a voltage. Schottky
diodes clamp the output signal for large input currents
(Figure 1).
Voltage Amplifier
The voltage amplifier provides additional gain and converts the transimpedance amplifier single-ended output
into a differential signal.
6
OUTPUT (SMALL SIGNALS)
OUTPUT (LARGE SIGNALS)
Figure 1. MAX3658 Limited Output
_______________________________________________________________________________________
622Mbps, Low-Noise, High-Gain
Transimpedance Preamplifier
AMPLITUDE
Select Photodiode
INPUT FROM PHOTODIODE
TIME
INPUT AFTER DC CANCELLATION
Noise performance and bandwidth are adversely affected
by capacitance on the TIA input node. Select a lowcapacitance photodiode to minimize the total input capacitance on this pin. The MAX3658 is optimized for 0.5pF of
capacitance on the input. Assembling the MAX3658 in die
form using chip and wire technology provides the lowest
capacitance input and the best possible performance.
Select CFILT
Figure 2. DC Cancellation Effect on Input
Output Buffer
The output buffer is designed to drive a 150Ω differential load between OUT+ and OUT-. For optimum supply
noise rejection, the MAX3658 should be terminated with
a differential load. The MAX3658 single-ended outputs
do not drive a DC-coupled grounded load. The outputs
should be AC-coupled or terminated to VCC. If a singleended output is required, both the used and the unused
outputs should be terminated in a similar manner (see
the Interface Schematics section).
DC Cancellation Circuit
The DC cancellation circuit uses low-frequency feedback to remove the DC component of the input signal
(Figure 2). This feature centers the input signal within
the transimpedance amplifier’s linear range, thereby
reducing pulse-width distortion.
The DC cancellation circuit is internally compensated
and does not require external capacitors. This circuit
minimizes pulse-width distortion for data sequences
that exhibit a 50% mark density. A mark density significantly different from 50% causes the MAX3658 to generate pulse-width distortion. Grounding the FILT pin
disables the DC cancellation circuit. For normal operation, the DC cancellation circuit must be enabled.
The DC cancellation current is drawn from the input and
creates noise. For low-level signals with little or no DC
component, the added noise is insignificant. However,
amplifier noise increases for signals with significant DC
component (see the Typical Operating Characteristics).
Supply voltage noise at the cathode of the photodiode
produces a current i = CPD dv/dt, which reduces the
receiver sensitivity (C PD is the photodiode capacitance). The filter resistor of the MAX3658 combined
with an external capacitor, can be used to reduce the
effect of supply noise on performance (see the Typical
Operating Circuit). Current generated by supply noise
voltage is divided between CFILT and CPD. To obtain a
good optical sensitivity select CFILT ≈ 400pF.
Select Supply Filter
Sensitive optical receivers require wide-band powersupply decoupling. Power-supply bypassing should
provide low impedance between VCC and ground for
frequencies between 10kHz and 700MHz. Isolate the
MAX3658 from noise sources with LC supply filters and
shielding. Place a supply filter (CVCC2) as close to the
MAX3658 as possible.
Select RMON
If photocurrent monitoring is desired, connect a resistor
between MON and ground to monitor the average photocurrent. Select RMON as large as possible:
RMON =
IMONMAX
where IMONMAX is the largest average input current
observed. An ammeter can also monitor the current out
of the MON pin.
Select Coupling Capacitors
A receiver built with the MAX3658 will have a bandpass
frequency response. The low-frequency cutoff due to
the coupling capacitors and load resistors is:
Photocurrent Monitor
The MAX3658 includes an average photocurrent monitor. The current sourced from MON to ground is approximately equal to the DC current at IN.
2.2V
LFC TERM =
1
2π × RLOAD × CCOUPLE
_______________________________________________________________________________________
7
MAX3658
Design Procedure
MAX3658
622Mbps, Low-Noise, High-Gain
Transimpedance Preamplifier
Select CCOUPLE so the low-frequency cutoff due to the
load resistors and coupling capacitors is much lower
than the low-frequency cutoff of the MAX3658. The coupling capacitor should be 0.1µF or larger for SONET
data. For lowest jitter, 1.0µF is recommended. Refer to
application note HFAN-1.1: Choosing AC-Coupling
Capacitors for a more detailed discussion on choosing
AC-coupling capacitors.
Select Output Filter
VCC
MON
PHOTODIODE
CVCC2
5-PIN HEADER
Input sensitivity is improved by adding a filter between
TIA and the quantizer/limiting amplifier, with 0.5pF input
capacitance. Typical bandwidth of the MAX3658 is
580MHz; the highest expected bandwidth is 730MHz.
OUT-
IN
FILT
MON
OUT+
Layout Considerations
PHOTODIODE
MOUNTED ON CFILT
OUTPUT POLARITIES
REVERSED FOR MAX3658B
CASE IS GROUND
MAX3658A
Figure 3 shows suggested layouts for 4- and 5-pin TO
headers.
Wire Bonding
CVCC2
VCC
PHOTODIODE
4-PIN HEADER
OUT+
OUT-
IN
FILT
MON
For high-current density and reliable operation, the
MAX3658 uses gold metalization. For best results, use
gold-wire ball-bonding techniques. Use caution when
wedge bonding. Die-size is 52 mils x 29 mils, (1.32mm
x 0.736mm) and die thickness is 15 mils (380µm). The
bond-pad passivation opening is 75µm and bond-pad
metal thickness is 5µm. Refer to Maxim application note
HFAN-08.0.1: Understanding Bonding Coordinates and
Physical Die Size for additional information on bondpad coordinates.
Applications Information
PHOTODIODE
MOUNTED ON CFILT
OUTPUT POLARITIES
REVERSED FOR MAX3658B
CASE IS GROUND
MAX3658A
Optical Power Relations
Many of the MAX3658 specifications relate to the input
signal amplitude. When working with optical receivers,
the input is sometimes expressed in terms of average
optical power and extinction ratio. Figure 4 and Table 1
show relations that are helpful for converting optical
power to input signal when designing with the MAX3658.
Optical Sensitivity Calculation
The input-referred RMS noise current (i n ) of the
MAX3658 generally determines the receiver sensitivity.
To obtain a system bit-error rate (BER) of 1E-10, the
signal-to-noise ratio must always exceed 12.7. The
input sensitivity, expressed in average power, can be
estimated as:
(
)
 12.7 × i × r + 1

n
e
SENSITIVITY = 10log
× 1000 dBm
 2 × ρ × r − 1



e
(
)
Figure 3. Suggested TO Header Layouts
Table 1. Optical Power Relations*
PARAMETER
SYMBOL
Average Power
PAVG
Extinction Ratio
re
Optical Power of a 1
P1
Optical Power of a 0
P0
Optical Modulation
Amplitude
PIN
RELATION
P0 + P1
2
P1
re =
P0
re
P1 = 2PAVG
re + 1
2PAVG
P0 =
re + 1
PIN = P1 − P0
r − 1
= 2PAVG e
re + 1
PAVG =
*Assuming a 50% average mark density.
8
_______________________________________________________________________________________
622Mbps, Low-Noise, High-Gain
Transimpedance Preamplifier
OPTICAL POWER
P1
(
)
 4µA × r + 1

e
LINEAR RANGE = 10log
× 1000 dBm
2 × ρ × r − 1



e
PAVG
(
)
For example, with photodiode responsivity of 0.9A/W
and an extinction ratio of 10, the linear range is:
P0
TIME
 4µA × 11

LINEARRANGE = 10log
× 1000 dBm
 2 × 0.9 × 9

= − 25dBm
Figure 4. Optical Power Relations
Interface Schematics
where ρ is the photodiode responsivity in A/W and in is
the RMS noise current in amps. For example, with photodiode responsivity of 0.9A/W, an extinction ratio of 10
and 45nA input-referred noise, the sensitivity of the
MAX3658 is:
 12.7 × 45nA × 11

SENSITIVITY = 10log
× 1000 dBm
 2 × 0.9A / W × 9

= − 34dBm
Actual results may vary depending on supply noise,
output filter, limiting amplifier sensitivity, and other factors (refer to application note HFAN-3.0.0: Accurately
Estimating Optical Receiver Sensitivity).
Equivalent Output Interface
The MAX3658 has a differential output structure with
75Ω termination (150Ω differential). Figure 5 is a simplified diagram of the output interface. Common test
equipment is designed with a 50Ω single-ended termination (100Ω differential). Figures 6a and 6b show alternate interface schemes for the MAX3658.
VCC
ROUT
75Ω
ROUT
75Ω
VCC
OUT+
VCC
Maxim obtains -33dBm typ sensitivity combined with
the MAX3748.
OUT-
Input Optical Overload
Overload is the largest input that the MAX3658 accepts
while meeting the pulse-width distortion specification.
Optical overload can be estimated in terms of average
power with the following equation:
 2mA

OVERLOAD = 10log
× 1000 dBm
2 × ρ

For example, if photodiode responsivity is 1.0A/W, the
input overload is 0dBm.
Figure 5. Equivalent Output Interface
_______________________________________________________________________________________
9
MAX3658
Optical Linear Range
The MAX3658 has high gain, which limits the output for
large input signals. The MAX3658 operates in a linear
range for inputs not exceeding:
MAX3658
622Mbps, Low-Noise, High-Gain
Transimpedance Preamplifier
VCC
75Ω
75Ω
150Ω∗
150Ω∗
50Ω
50Ω
0.1µF
50Ω∗
0.1µF
50Ω∗
L
DIFFERENTIAL
INPUT STAGE
MAX3658
OUTPUT
STAGE
*COMPONENT NOT REQUIRED IF L < 5cm
Figure 6a. 50Ω AC-Coupled Interface
VCC
150Ω∗
75Ω
50Ω
150Ω∗
75Ω
50Ω
50Ω∗
L
SINGLE-ENDED
INPUT STAGE
MAX3658
OUTPUT
STAGE
NOTE: THE PARALLEL COMBINATION AT THE UNUSED OUTPUT
CAN BE REPLACED BY A SINGLE EQUIVALENT 37.5Ω RESISTOR.
*COMPONENT NOT REQUIRED IF L < 5cm
Figure 6b. 50Ω DC-Coupled Single-Ended Output Interface
10
______________________________________________________________________________________
622Mbps, Low-Noise, High-Gain
Transimpedance Preamplifier
Table 2 gives center pad coordinates for the MAX3658
bond pads. Refer to application note HFAN-8.0.1:
Understanding Bonding Coordinates and Physical Die
Size for more information on bond-pad coordinates.
400Ω
20kΩ
FILT
Table 2. Bond-Pad Information
20pF
PAD
Figure 7. FILT Interface
VCC
MON
NAME
COORDINATES (µm)
MAX3658A
MAX3658B
X
Y
BP1
MON
MON
16.6
818.6
BP2
GND
GND
18.0
543.4
BP3
N.C.
N.C.
18.0
425.8
BP4
OUT+
OUT-
16.6
39.4
BP5
OUT-
OUT+
445.0
39.4
BP6
N.C.
N.C.
456.2
155.6
BP7
GND
GND
455.0
565.8
BP8
VCC
VCC
455.0
818.6
BP9
IN
IN
254.6
818.6
BP10
FILT
FILT
135.6
818.6
Figure 8. MON Interface
Pin Configuration
Chip Information
TRANSISTOR COUNT: 833
PROCESS: GST-4
TOP VIEW
VCC
1
IN
2
FILT
3
MON
4
MAX3658
AGP**
8
GND
7
OUT-
6
OUT+
5
GND
TDFN*
(3mm x 3mm)
*THE EXPOSED PAD MUST BE CONNECTED TO CIRCUIT BOARD
GROUND FOR PROPER THERMAL AND ELECTRICAL PERFORMANCE.
**AGP = DEVICE TOPMARK.
______________________________________________________________________________________
11
MAX3658
Pad Coordinates
VCC
622Mbps, Low-Noise, High-Gain
Transimpedance Preamplifier
MAX3658
Chip Topographies
Topography for MAX3658A
MON
1
GND
2
N.C.
3
FILT
IN
10
9
8
VCC
7
GND
0.052in
1.32mm
OUT+
4
6
N.C.
5
OUT-
(0,0)
0.029in
0.736mm
12
______________________________________________________________________________________
622Mbps, Low-Noise, High-Gain
Transimpedance Preamplifier
Topography for MAX3658B
MON
1
GND
2
N.C.
3
FILT
IN
10
9
8
VCC
7
GND
0.052in
1.32mm
6
OUT-
5
4
N.C.
OUT+
(0,0)
0.029in
0.736mm
______________________________________________________________________________________
13
MAX3658
Chip Topographies (continued)
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
6, 8, &10L, DFN THIN.EPS
MAX3658
622Mbps, Low-Noise, High-Gain
Transimpedance Preamplifier
D
N
PIN 1
INDEX
AREA
E
E2
DETAIL A
CL
CL
L
A
L
e
e
PACKAGE OUTLINE, 6, 8, 10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
21-0137
NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY
E
1
2
COMMON DIMENSIONS
SYMBOL
A
MIN.
MAX.
0.70
0.80
D
2.90
3.10
E
2.90
3.10
A1
L
0.00
0.05
k
0.40
0.20
0.25 MIN.
A2
0.20 REF.
PACKAGE VARIATIONS
PKG. CODE
N
D2
E2
e
JEDEC SPEC
b
T633-1
6
1.50±0.10
2.30±0.10
0.95 BSC
MO229 / WEEA
0.40±0.05
1.90 REF
T833-1
8
1.50±0.10
2.30±0.10
0.65 BSC
MO229 / WEEC
0.30±0.05
1.95 REF
T1033-1
10
1.50±0.10
2.30±0.10
0.50 BSC
MO229 / WEED-3
0.25±0.05
2.00 REF
T1433-1
14
1.70±0.10
2.30±0.10
0.40 BSC
----
0.20±0.03
2.40 REF
[(N/2)-1] x e
PACKAGE OUTLINE, 6, 8, 10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
21-0137
E
2
2
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2004 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.