The ISL1535 is a very low power dual channel differentiated
amplifier designed for central office line driving for DMT
ADSL2+ solutions. This device features a high drive
capability of 600mA while consuming 5.2mA of supply
current per amplifier from ±12V supplies. This driver
achieves a typical distortion of less than -75dBc, at 1MHz
into a 50Ω load. The ISL1535 is available in 28 Ld HTSSOP
package. This device is specified for operation over the full
-40°C to +85°C temperature range.
The ISL1535 has two control pins, C
With the selection of C
full-I
power , 3/4-IS power, 1/2-IS power, and power-down
S
and C1, the device can be set into
0
and C1, per channel.
0
disable modes. The ISL1535 maintains excellent distortion
and load driving capabilities even in the lowest power
settings. The ISL1535 has extended bandwidth, low THD
and high slew rate for ADSL2+ applications.
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100% matte
tin plate termination finish, which are RoHS compliant and compatible
with both SnPb and Pb-free soldering operations. Intersil Pb-free
products are MSL classified at Pb-free peak reflow temperatures that
meet or exceed the Pb-free ruirements of IPC/JEDEC J STD-020.
PART
MARKING
TAPE
&
REEL
PACKAGE
(Pb-free)
PKG.
DWG. #
May 10, 2007
FN6226.0
Features
• Drives 400mA at 16V
•21.4V
•20.6V
differential output drive into 100Ω
P-P
minimum differential output drive into 60Ω
P-P
• -75dBc typical driver output distortion driving 50Ω at 1MHz
and 1/2-I
bias current
S
• Quiescent current of 5.2mA per amplifier in 1/2-I
• 100MHz BW at A
V
• Current control pins to select power modes
• Pin-to-pin replacement for EL1527 and EL1537
• Pb-free plus anneal available (RoHS compliant)
on ±12V supplies
P-P
= 10
mode
S
Applications
• ADSL, ADSL2, ADSL2+ line drivers
• G.SHDSL, HDSL2 line drivers
• VDSL line drivers
• Video distribution amplifiers
• Video twisted-pair line drivers
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or1-888-468-3774
| Intersil (and design) is a registered trademark of Intersil Americas Inc.
All other trademarks mentioned are the property of their respective owners.
223C0AB (Note 1)DSL Channel 1 current control pin
324C1AB (Note 1)DSL Channel 1 current control pin
41VINB+Amplifier B non-inverting input
52VINB-Amplifier B inverting input
63VOUTBAmplifier B output
7, 214, 16VS+Positive supply
8, 12, 13, 22, 26, 279, 21NCNot connected
95VOUTCAmplifier C output
106VINC-Amplifier C inverting input
117VINC+Amplifier C non-inverting input
14, 288, 20GNDGround connection
1611C0CD (Note 2)DSL Channel 2 current control pin
1712C1CD (Note 2)DSL Channel 2 current control pin
1813VIND+Amplifier D non-inverting input
1914VIND-Amplifier D inverting input
2015VOUTDAmplifier D output
2317VOUTAAmplifier A output
2418VINA-Amplifier A inverting input
2519VINA+Amplifier A non-inverting input
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all tests are
at the specified temperature and are pulsed tests, therefore: T
Electrical SpecificationsV
= ±12V, RF = 1.5kΩ, RL = 50Ω to GND, TA = +25°C, unless otherwise specified.
Offset Voltage-10+10mV
VOS Mismatch-2.5+2.5mV
TransimpedanceV
from -9V to +9V1410MΩ
OUT
INPUT CHARACTERISTICS
+Non-Inverting Input Bias Current-25+25µA
I
B
-Inverting Input Bias Current-10070µA
I
B
-I
ΔI
B
e
N
++Input Noise Current4.7pA/√Hz
i
N
--Input Noise Current10pA/√Hz
i
N
V
IH
V
IL
I
IH
I
IL
- Mismatch-2020µA
B
Input Noise Voltage3.9nV√Hz
Input High VoltageC0 and C1 inputs2.0V
Input Low VoltageC0 and C1 inputs0.8V
Input High Current for C1or C
Input Low Current for C1or C
0
0
C1 = 5V, C0 = 5V50100200µA
C1 = 0V, C0 = 0V-11µA
OUTPUT CHARACTERISTICS
V
OUT
PLoaded Output Swing Single-EndedRL = 30Ω to GND1010.4V
V
OUT
NLoaded Output Swing Single-EndedRL = 30Ω to GND-10.4-10V
V
OUT
I
OUT
Loaded Output Swing Single-EndedRL = 100Ω to GND±10.5±10.8V
Output CurrentRL = 0Ω500mA
4
FN6226.0
May 10, 2007
ISL1535
Electrical SpecificationsV
= ±12V, RF = 1.5kΩ, RL = 50Ω to GND, TA = +25°C, unless otherwise specified. (Continued)
S
PARAMETERDESCRIPTIONCONDITIONSMINTYPMAXUNIT
SUPPLY
V
S
I
S+ (Full Power)
I
S- (Full Power)
I
S+ (3/4 Power)
I
S- (3/4 Power)
I
S+ (1/2 Power)
I
S- (1/2 Power)
I
S+ (Power Down)
I
S- (Power Down)
I
GND
Supply VoltageSingle supply530V
Positive Supply Current per AmplifierAll outputs at 0V, C0 = C1 = 0V13.3mA
Negative Supply Current per AmplifierAll outputs at 0V, C0 = C1 = 0V-13.0mA
Positive Supply Current per AmplifierAll outputs at 0V, C0 = 5V, C1 = 0V10.5mA
Negative Supply Current per AmplifierAll outputs at 0V, C0 = 5V, C1 = 0V-10.2mA
Positive Supply Current per AmplifierAll outputs at 0V, C0 = 0V, C1 = 5V5.256.2mA
Negative Supply Current per AmplifierAll outputs at 0V, C0 = 0V, C1 = 5V-6.0-5.0mA
Positive Supply Current per AmplifierAll outputs at 0V, C0 = C1 = 5V0.50.75mA
Negative Supply Current per AmplifierAll outputs at 0V, C0 = C1 = 5V-0.5-0.2mA
GND Supply Current per AmplifierAll outputs at 0V0.25mA
Typical Performance Curves
23
VS = ±12V
A
C
20
R
17
= 5
V
= 2pF
L
= 100Ω DIFF
L
RF = 1kΩ
RF = 1.5kΩ
32
VS = ±12V
A
C
28
R
24
= 10
V
= 2pF
L
= 100Ω DIFF
L
RF = 1kΩ
RF = 1.5kΩ
14
GAIN (dB)
11
8
5
100k1M10M100M1G
RF = 2kΩ
FREQUENCY (Hz)
FIGURE 1. DIFFERENTIAL FREQUENCY RESPONSE WITH
GAIN (dB)
23
20
17
14
11
8
VARIOUS R
VS = ±12V
= 5
A
V
= 2pF
C
L
= 100Ω DIFF
R
L
(FULL POWER MODE)
F
RF = 1.5kΩ
RF = 2kΩ
RF = 1kΩ
20
GAIN (dB)
16
12
8
100k1M10M100M1G
RF = 2kΩ
FREQUENCY (Hz)
FIGURE 2. DIFFERENTIAL FREQUENCY RESPONSE WITH
VARIOUS RF (FULL POWER MODE)
32
VS = ±12V
= 10
A
V
28
= 2pF
C
L
= 100Ω DIFF
R
L
24
20
GAIN (dB)
16
12
RF = 1.5kΩ
RF = 2kΩ
RF = 1kΩ
5
100k1M10M100M1G
FREQUENCY (Hz)
FIGURE 3. DIFFERENTIAL FREQUENCY RESPONSE WITH
VARIOUS R
(3/4-POWER MODE)
F
5
8
100k1M10M100M1G
FREQUENCY (Hz)
FIGURE 4. DIFFERENTIAL FREQUENCY RESPONSE WITH
VARIOUS RF (3/4-POWER MODE)
FN6226.0
May 10, 2007
Typical Performance Curves (Continued)
28
GAIN (dB)
24
20
16
12
8
VS = ±12V
= 5
A
V
= 2pF
C
L
R
= 100Ω DIFF
L
RF = 1.5kΩ
RF = 2kΩ
RF = 1kΩ
ISL1535
GAIN (dB)
34
30
26
22
18
14
10
VS = ±12V
= 10
A
V
C
= 2pF
L
= 100Ω DIFF
R
L
RF = 1.5kΩ
RF = 2kΩ
RF = 1kΩ
4
100k1M10M100M1G
FREQUENCY (Hz)
FIGURE 5. DIFFERENTIAL FREQUENCY RESPONSE WITH
VARIOUS R
32
VS = ±12V
A
= 10
V
28
= 1.5kΩ
R
F
=100Ω DIFF
R
L
24
20
GAIN (dB)
16
12
8
100k1M10M100M1G
(1/2-POWER MODE)
F
CL = 8pF
CL = 2pF
FREQUENCY (Hz)
CL = 13pF
FIGURE 7. DIFFERENTIAL FREQUENCY RESPONSE WITH
VARIOUS C
(FULL POWER MODE)
LOAD
6
100k1M10M100M1G
FREQUENCY (Hz)
FIGURE 6. DIFFERENTIAL FREQUENCY RESPONSE WITH
VARIOUS RF (1/2-POWER MODE)
32
VS = ±12V
= 10
A
V
28
= 1.5KΩ
R
F
= 100Ω DIFF
R
L
24
20
GAIN (dB)
16
12
8
100k1M10M100M1G
CL = 8pF
CL = 2pF
FREQUENCY (Hz)
CL = 13pF
FIGURE 8. DIFFERENTIAL FREQUENCY RESPONSE WITH
VARIOUS C
(3/4-POWER MODE)
LOAD
34
VS = ±12V
= 10
A
30
V
= 1.5kΩ
R
F
= 100Ω DIFF
R
L
26
22
18
GAIN (dB)
14
10
6
100k1M10M100M1G
CL = 8pF
CL = 2pF
FREQUENCY (Hz)
CL = 13pF
FIGURE 9. DIFFERENTIAL FREQUENCY RESPONSE WITH
VARIOUS C
(1/2-POWER MODE)
LOAD
6
120
AV = 10
110
100
BANDWIDTH (MHz)
= 1.5kΩ
R
F
= 100Ω DIFF
R
L
90
80
70
60
50
40
3456789101112
FULL POWER
3/4 POWER
1/2 POWER
± VS (V)
FIGURE 10. DIFFERENTIAL BANDWIDTH vs SUPPL Y
VOLTAGE
FN6226.0
May 10, 2007
Typical Performance Curves (Continued)
-20
VS = ±12V
A
= 10
V
-30
= 1.5kΩ
R
F
F = 1MHz
-40
= 100Ω DIFF
R
L
-50
-60
-70
HARMONIC DISTORTION (dB)
-80
-90
261014182226303438
HD3
DIFFERENTIAL OUTPUT (V
FIGURE 11. DIFFERENTIAL HARMONIC DISTORTION vs
DIFFERENTIAL OUTPUT AMPLITUDE
(FULL POWER MODE)
HD2
)
P-P
ISL1535
-10
VS = ±12V
A
= 10
-20
V
= 1.5KΩ
R
F
F = 2.2MHz
-30
R
= 100Ω DIFF
L
-40
-50
-60
-70
HARMONIC DISTORTION (dB)
-80
-90
26101418222630
DIFFERENTIAL OUTPUT (V
HD3
HD2
)
P-P
FIGURE 12. DIFFERENTIAL HARMONIC DIST ORTION vs
DIFFERENTIAL OUTPUT AMPLITUDE
(FULL POWER MODE)
-20
VS = ±12V
= 10
A
-30
V
= 1.5kΩ
R
F
F = 1MHz
-40
= 100Ω DIFF
R
L
-50
-60
-70
HARMONIC DISTORTION (dB)
-80
-90
261014182226303438
HD3
DIFFERENTIAL OUTPUT (V
HD2
)
P-P
FIGURE 13. DIFFERENTIAL HARMONIC DISTORTION vs
DIFFERENTIAL OUTPUT AMPLITUDE
(3/4-POWER MODE)
-20
VS = ±12V
-30
= 10
A
V
R
= 1.5kΩ
F
F = 1MHz
-40
= 100Ω
R
L
-50
-60
-70
HARMONIC DISTORTION (dB)
-80
-90
261014182226303438
DIFFERENTIAL OUTPUT (V
HD3
HD2
)
P-P
FIGURE 15. DIFFERENTIAL HARMONIC DISTORTION vs
DIFFERENTIAL OUTPUT AMPLITUDE
(1/2-POWER MODE)
-10
VS = ±12V
-20
= 10
A
V
R
= 1.5kΩ
F
-30
F = 2.2MHz
= 100Ω DIFF
R
L
-40
-50
-60
-70
HARMONIC DISTORTION (dB)
-80
-90
26101418222630
HD3
DIFFERENTIAL OUTPUT (V
HD2
)
P-P
FIGURE 14. DIFFERENTIAL HARMONIC DIST ORTION vs
DIFFERENTIAL OUTPUT AMPLITUDE
(3/4-POWER MODE)
-10
VS = ±12V
-20
= 10
A
V
= 1.5kΩ
R
F
-30
F = 2.2MHz
= 100Ω DIFF
R
L
-40
-50
-60
-70
HARMONIC DISTORTION (dB)
-80
-90
26101418222630
DIFFERENTIAL OUTPUT (V
HD3
HD2
)
P-P
FIGURE 16. DIFFERENTIAL HARMONIC DIST ORTION vs
DIFFERENTIAL OUTPUT AMPLITUDE
(1/2-POWER MODE)
7
FN6226.0
May 10, 2007
Typical Performance Curves (Continued)
10
0
-10
-20
-30
-40
-50
POSITIVE PSRR (dB)
-60
-70
-80
FULL POWER
1001k10k100 k1M10M100M
FREQUENCY (Hz)
FIGURE 17. POSITIVE PSRR vs FREQUENCYFIGURE 18. NEGATIVE PSRR vs FREQUENCY
1/2 POWER
3/4 POWER
ISL1535
10
0
-10
-20
-30
-40
-50
NEGATIVE PSRR (d B)
-60
-70
-80
1001k10k100k1M10M100M
FULL POWER
3/4 POWER
1/2 POWER
FREQUENCY (Hz)
-20
VS = ±12V
-30
= 5
A
V
= 1.5kΩ
R
-40
F
= 100Ω DIFF
R
L
-50
-60
-70
-80
-90
-100
CHANNEL SEPARATION (dB)
-110
-120
1k10k100k1M10M100M
AB ≥ CD
CD ≥ AB
FREQUENCY (Hz)
100
VS = ±12V
A
= 5
V
= 1.5kΩ
R
F
= 100Ω DIFF
R
L
10
(Ω)
OUT
R
1
0.1
10k100k1M10M100M
FREQUENCY (Hz)
FIGURE 19. CHANNEL SEPARATION vs FREQUENCYFIGURE 20. OUTPUT IMPEDANCE vs FREQUENCY
FIGURE 24. SMALL STEP RESPONSEFIGURE 25. LARGE STEP RESPONSE
JEDEC JESD51-3 LOW EFFECTIVE THERMAL
CONDUCTIVITY TEST BOARD
1.2
1.0
0.8
893mW
0.6
0.4
POWER DISSIPATION (W)
0.2
0
04
1.136W
HTSSOP28
θ
= +110°C/W
JA
QFN24
θ
= +140°C/W
JA
2521
AMBIENT TEMPERATURE (°C)
23
FIGURE 26. PACKAGE POWER DISSIP A TION vs AMBIENT
TEMPERATURE
9
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL
CONDUCTIVITY TEST BOARD - HTSSOP EXPOSED
DIEPAD SOLDERED TO PCB PER JESD51-5
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
POWER DISSIPATION (W)
0.5
0
0150
4.167W
3.378W
QFN24
θ
= +37°C/W
JA
2510050
AMBIENT TEMPERATURE (°C)
75125
HTSSOP28
θ
= +30°C/W
JA
85
FIGURE 27. PACKAGE POWER DISSIP A TION vs AMBIENT
TEMPERATURE
FN6226.0
May 10, 2007
ISL1535
Applications Information
The ISL1535 consists of two sets of high-power line driver
amplifiers that can be connected for full duplex differential
line transmission. The amplifiers are designed to be used
with signals up to 4MHz and produce low distortion levels. A
typical interface circuit is shown in Figure 28.
+
V
S
R
TX+
FROM
AFE
332Ω
T
2R
X
+
R
1.5kΩ
G
-
+
-
R
1.5kΩ
FIGURE 28. TYPICAL LINE INTERFACE CONNECTION
The driver takes a differential signal and generate a
differential output. Each amplifier has identical positive gain
connections for optimum common-mode rejection to occur.
Further, DC input errors are duplicated, creating commonmode rather than differential line errors.
Feedback Resistor Value
The bandwidth and peaking of the amplifiers varies with
feedback and gain settings. The feedback resistor values
can be adjusted to produce an optimal frequency response.
B
50Ω
VS-
F
+
V
S
R
B
50Ω
-
V
S
F
0.22µF
0.22µF
TXFR
1:2
100
Table 1 lists the recommended resistor values which
produce an optimal driver frequency response.
TABLE 1. OPTIMUM DRIVER FEEDBACK RESISTOR FOR
SUPPLY VOLTAGE
±12V @ Full Power1.5k1.5k
±12V @ 1/2 Power3k2k
VARIOUS GAINS
DRIVER VOLTAGE GAIN
510
Power Control Function
The ISL1535 contains two forms of power control operation.
Two digital inputs (C
and C1) can be used to control the
0
supply current of the ISL1535 drive amplifiers. As the supply
current is reduced, the ISL1535 will start to exhibit slightly
higher levels of distortion and the frequency response will be
limited. The four power modes of the ISL1535 are set up as
shown in Table 2
C
1
00I
013/4-I
101/2-IS Power Mode
11Power Down
.
TABLE 2. POWER MODES OF THE ISL1535
C
0
Full Power Mode
S
Power Mode
S
OPERATION
See ISL1535 Application Notes for further
information.
1. Dimension “D” does not include mold flash, protrusions or gate
burrs. Mold flash, protrusions or gate burrs shall not exceed
0.15mm per side.
2. Dimension “E1” does not include interlead flash or protrusions.
Interlead flash and protrusions shall not exceed 0.25mm per
side.
3. Dimensions “D” and “E1” are measured at Datum Plane H.
4. Dimensioning and tolerancing per ASME Y14.5M-1994.
TOLERANCE14 LD 20 LD 24 LD 28 LD 38 LD
Rev. 3 2/07
SEE DETAIL “X”
END VIEW
L1
A2
A
A1
DETAIL X
L
0° - 8°
GAUGE
PLANE
c
0.25
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implicat ion or oth erwise u nde r any p a tent or p at ent r ights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
11
FN6226.0
May 10, 2007
ISL1535
QFN (Quad Flat No-Lead) Package Family
A
1
2
3
2X
0.075 C
L
(E2)
C
SEATING
PLANE
0.08 C
N LEADS
& EXPOSED PAD
A
C
N
(N-2)
(N-1)
PIN #1
I.D. MARK
TOP VIEW
0.10BAMC
b
N LEADS
(N/2)
BOTTOM VIEW
e
SIDE VIEW
(c)
A1
DETAIL X
D
(N/2)
(N-2)
(N-1)
N
(D2)
0.10
SEE DETAI L "X"
2
(L)
N LEADS
0.075
PIN #1 I.D.
1
2
3
NE
7
C
2X
B
E
C
3
5
MDP0046
QFN (QUAD FLAT NO-LEAD) PACKAGE FAMILY
(COMPLIANT TO JEDEC MO-220)