Storage Temperature Range .......................... -55NC to +150NC
Die Attach Temperature .................................................+400NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion 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.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
TQFN
Junction-to-Ambient Thermal Resistance (B
JA
) ..........48NC/W
Junction-to-Case Thermal Resistance (B
JC
) ...............10NC/W
Note 1:
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to
www.maximintegrated.com/thermal-tutorial.
ELECTRICAL CHARACTERISTICS
(V
CC
= V
CCT
= 2.95V to 3.63V, T
A
= -40NC to +95NC; typical values are at V
CC
= V
CCT
= 3.3V, T
A
= +25NC, LD
DC
= 20mA, LD
MOD
= 40mA, and 14I single-ended electrical output load, unless otherwise noted. See
Figure 1
for electrical setup.) (Note 2)
PARAMETER
POWER SUPPLY
Power-Supply Current
Power-Supply Voltage
POWER-ON RESET
V
CC
for Enable High
V
CC
for Enable Low
DATA INPUT SPECIFICATION
Input Data Rate
Launch amplitude into FR4 transmission
line
P
12in,
SET_TXEQ[1:0] = 01b,
SET_TXEQ[1:0] = 11b
Differential Input Voltage
V
IN
SET_TXEQ[1:0] = 01b,
SET_TXEQ[1:0] = 11b,
outside of optimized range
SET_TXEQ[1:0] = 00b
Common-Mode Input Voltage
Differential Input Resistance
Maxim Integrated
SYMBOL
CONDITIONS
Excludes output current through the exter-
nal pullup inductors (Note 3)
MIN
TYP
MAX
UNITS
I
CC
V
CCT
, V
CC
51
2.95
2.55
2.3
1
2.45
10.3
62
3.63
2.75
mA
V
V
V
11.3
Gbps
0.2
0.8
V
P-P
0.15
0.15
2.15
75
100
1.0
1.0
V
125
I
2
V
CM
R
IN
MAX3948
11.3Gbps, Low-Power, DC-Coupled Laser Driver
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= V
CCT
= 2.95V to 3.63V, T
A
= -40NC to +95NC; typical values are at V
CC
= V
CCT
= 3.3V, T
A
= +25NC, LD
DC
= 20mA, LD
MOD
= 40mA, and 14I single-ended electrical output load, unless otherwise noted. See
Figure 1
for electrical setup.) (Note 2)
PARAMETER
Differential Input S-Parameters
(Note 4)
SYMBOL
SCD11
SDD11
SCC11
f
P
4.1GHz
4.1GHz
P
f
P
11.3GHz
CONDITIONS
0.1GHz
P
f
P
11.3GHz
MIN
TYP
-40
-19
-16
-15
50
61
2.5
0.1
116
INL
DNL
2.5mA
P
I
DC
P
50mA
Guaranteed monotonic at 8-bit resolution,
SET_IDC[8:1]
2.5mA
P
I
DC
P
50mA, V
VOUT
= V
CCT
- 1.5V
(Notes 6, 7)
V
CCT
-2
G
BMON
G
BMON
= I
BMON
/I
DC
, external resistor to
GND defines voltage
2.5mA
P
I
DC
P
50mA, V
VOUT
= V
CCT
- 1.5V
(Notes 6, 7)
0
Current into TOUTC pin, 5I laser load,
6.25% deemphasis
Current into TOUTC pin, 5I laser load,
6.25% deemphasis
Current into TOUTC pin
99.7
130
247
INL
DNL
V
TOUTA
V
TOUTC
Guaranteed monotonic at 8-bit resolution,
SET_IMOD[8:1]
With external inductive pullup to V
CCT
With external inductive pullup to VOUT
V
CCT
- 1
0.6
±1
±0.5
V
CCT
+ 1
V
CCT
- 1
15
±0.5
±0.5
1
V
CCT
- 1.5
16.7
1.5
4
V
CCT
-1
20
5
1.8
mA
mA
mA
FA
%FS
LSB
%
V
mA/A
%
V
dB
MAX
UNITS
1GHz
P
f
P
11.3GHz, Z
CM_SOURCE
= 25W
DC CURRENT GENERATOR (Note 5, Figure 3)
Maximum DC DAC Current
Minimum DC DAC Current
DC-Off Current
DC DAC LSB Size
DC DAC Integral Nonlinearity
DC DAC Differential Nonlinearity
DC Current DAC Stability
DC Compliance Voltage at VOUT
BMON Current Gain
BMON Current Gain Stability
Compliance Voltage at BMON
LASER MODULATOR (Note 8)
Maximum Laser Modulation
Current
Minimum Laser Modulation
Current
Modulation-Off Laser Current
Modulation DAC Full-Scale
Current
Modulation DAC LSB Size
Modulation DAC Integral
Nonlinearity
Modulation DAC Differential
Nonlinearity
TOUTA and TOUTC
Instantaneous Output
Compliance Voltage
Maxim Integrated
I
DCMAX
I
DCMIN
I
DC-OFF
Current into VOUT pin
Current into VOUT pin
LD
MODMAX
LD
MODMIN
LD
MOD-
OFF
85
10
0.1
mA
P-P
mA
P-P
mA
mA
FA
%FS
LSB
V
I
MOD-FS
3
MAX3948
11.3Gbps, Low-Power, DC-Coupled Laser Driver
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= V
CCT
= 2.95V to 3.63V, T
A
= -40NC to +95NC; typical values are at V
CC
= V
CCT
= 3.3V, T
A
= +25NC, LD
DC
= 20mA, LD
MOD
= 40mA, and 14I single-ended electrical output load, unless otherwise noted. See
Figure 1
for electrical setup.) (Note 2)
PARAMETER
Modulation Output Termination
Modulation Current DAC Stability
Modulation Current Rise/Fall
Time
t
R,
t
F
SYMBOL
R
OUT
10mA
P
LD
MOD
P
85mA,
V
VOUT
= V
CCT
- 1.5V (Notes 6, 7)
20% to 80%, 10mA
P
LD
MOD
P
85mA
(Note 6)
10mA
P
LD
MOD
P
85mA, 8.5Gbps with
K28.5 pattern
Deterministic Jitter (Note 6)
DJ
10mA
P
LD
MOD
P
85mA, 10.3125Gbps
(Note 9)
10mA
P
LD
MOD
P
85mA, 11.3Gbps
(Note 9)
Random Jitter
RJ
10mA
P
LD
MOD
P
85mA (Note 6)
0.1GHz
P
f
P
4.1GHz, Z
CM_SOURCE
=
12.5W
4.1GHz < f
P
11.3GHz, Z
CM_SOURCE
=
12.5W
0.1GHz< f
P
11.3GHz, Z
DIFF_SOURCE
=
50W
Fault never occurs for V
VOUT
R
V
CCT
- 2V,
fault always occurs for V
VOUT
< V
CCT
-
2.8V, referenced to V
CCT
Fault never occurs for V
VOUT
R
1.7V, fault
always occurs for V
VOUT
< 1.35V,
referenced to GND,
SET_IMOD[8:6] = 111b
Fault never occurs for V
VOUT
R
0.57V, fault
always occurs for V
VOUT
< 0.43V,
referenced to GND,
SET_IMOD[8:6] = 000b
Threshold Voltage at TOUTC
Fault never occurs for V
TOUTC
R
0.48V,
fault always occurs for V
TOUTC
< 0.35V
Fault never occurs for V
TOUTA
R
V
CCT
-
1.45V, fault always occurs for V
TOUTA
<
V
CCT
- 1.88V
Fault never occurs for V
CCT
R
V
CC
- 0.15V,
fault always occurs for V
CCT
< V
CC
- 0.4V
CONDITIONS
MIN
19
TYP
25
1.5
26
4
6
8
0.19
-10
-6
-13
dB
12
13
0.55
ps
RMS
ps
P-P
MAX
31
4
36
UNITS
I
%
ps
Differential S-Parameters
(Note 4)
SCC22
SDD22
SAFETY FEATURES
V
CCT
-
2.8
V
CCT
-2
Threshold Voltage at VOUT
1.35
1.7
V
0.43
0.57
0.35
V
CCT
-
1.88
V
CC
-
0.4
0.48
V
CCT
-
1.45
V
CC
-
0.15
V
Threshold Voltage at TOUTA
V
Threshold Voltage at V
CCT
V
Maxim Integrated
4
MAX3948
11.3Gbps, Low-Power, DC-Coupled Laser Driver
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= V
CCT
= 2.95V to 3.63V, T
A
= -40NC to +95NC; typical values are at V
CC
= V
CCT
= 3.3V, T
A
= +25NC, LD
DC
= 20mA, LD
MOD
= 40mA, and 14I single-ended electrical output load, unless otherwise noted. See
Figure 1
for electrical setup.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
LD
DC
= 25mA, LD
MOD
= 65mA, DC and
modulation DAC are both H0x00, time from
TX_EN = high to LD
DC
and LD
MOD
at 90%
of steady state
Time from rising edge of DISABLE input
signal to LD
DC
and LD
MOD
at 10% of
steady state (Note 6)
Time from falling edge of DISABLE to LD
DC
and LD
MOD
at 90% of steady state (Note 6)
Time from negation of latched fault using
DISABLE to LD
DC
and LD
MOD
at 90% of
steady state
Time from fault to FAULT = high, C
FAULT
≤
20pF, R
FAULT
= 4.7kW
Time DISABLE must be held high to reset
fault
V
IH
V
IL
V
HYST
C
IN
R
PULL
I
IH
I
IL
I
IH
Input Leakage Current (SDA)
I
IL
I
IH
I
IL
V
OH
V
OL
Internal pullup resistor
Input connected to V
CC
Input connected to GND
Input connected to V
CC
Input connected to GND; internal pullup is
75kW typical
Input connected to V
CC
; internal pulldown
is 75kW typical
Input connected to GND
External pullup is (4.7kI to 10kI) to V
CC
External pullup is (4.7kI to 10kI) to V
CC
-2
35
35
-2
V
CC
- 0.1
0.4
4.7
7.5
440
4
MIN
TYP
MAX
UNITS
TIMING REQUIREMENTS (Notes 5, 6, 8)
Initialization Time
t
INIT
250
ns
DISABLE Assert Time
t
OFF
t
ON
t
RECOVER
t
FAULT
25
75
ns
DISABLE Negate Time
250
600
ns
FAULT Reset Time
250
600
ns
FAULT Assert Time
DISABLE to Reset Time
0.7
3
Fs
Fs
DIGITAL I/O SPECIFICATIONS (SDA, SCL, CSEL, FAULT, DISABLE)
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