200761B.pdf

DATA SHEET
SKY74068-21: Dual-Band Transmitter for CDMA and PCS
Femtocell Applications
Applications
Description
 Dual-band femtocells
The SKY74068-21 transmitter is a highly integrated device for
dual-band Code Division Multiple Access (CDMA) femtocells. The
SKY74068-21 supports femtocells in the cellular CDMA and
Personal Communications System (PCS) modes.
Features
 Low power consumption in all operating modes
 Direct upconversion architecture
 Device controlled using a three-wire read/write serial bus
interface with independent supply voltage
 Baseband RC filter to reject receive band noise
 Fully integrated VCO with auto-tuning
 Dual-mode fractional-N/integer-N PLL
 Variable gain PA drivers
 Differential cellular driver output matched to 200 
 Single-ended PCS driver output matched to 50 
 Transmit power control with >75 dB dynamic range
 Low current consumption at low transmit power minimizes
current consumption and noise
 Hardware TX_ENABLE for gated mode operation
 RFLGA™ (32-pin, 5 x 5 x 1 mm) package with downset paddle
(MSL3, 260 C per JEDEC J-STD-020)
Skyworks offers lead (Pb)-free, RoHS (Restriction of
Hazardous Substances) compliant packaging.
The device requires a minimum number of external components
to complete a CDMA radio subsystem. Included on-chip are the
baseband filter, direct upconversion In-Phase and Quadrature (I/Q)
mixers, variable gain power amplifier (PA) drivers, a fully
integrated Voltage Controlled Oscillator (VCO) with Local Oscillator
(LO) generation blocks, and a dual-mode fractional-N/integer-N
Phase Locked Loop (PLL).
External components needed for operation include bias resistors,
bypass capacitors, and passives to comprise the PLL loop filter.
The signal enters the chip as an analog baseband I/Q signal. It is
filtered by the baseband filter and upconverted to the desired RF
transmit frequency. The signal is amplified by one of two
upconverters, depending on whether the chip is operating in
cellular or PCS mode. The resulting signal is fed through the
appropriate PA driver stage to provide variable output power and
to drive the external PA. The signal is then filtered by an external
Surface Acoustic Wave (SAW) filter and sent to the PA to obtain
the final rated power.
The 32-pin RF Land Grid Array (RFLGA) device package and
pinout are shown in Figure 1. Figure 2 shows a functional block
diagram for the SKY74068-21.
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1
REF
VCC_CLK
I–
I+
Q–
Q+
CS
DATA SHEET • SKY74068-21 CDMA TRANSMITTER
32
31
30
29
28
27
26
VCC_RF_4
N/C
3
23
VCC_RF_3
CP
4
22
PCS_OUT
VCC_PLL_2
5
21
VCC_RF_2
VCO_IO
6
20
CELL_OUT–
VCO_TUNE
7
19
CELL_OUT+
VCO_EXT_RES
8
18
TX_ENABLE
VCO_BYPASS
9
17
VCC_RF_1
10
11
12
13
14
15
16
GAIN_CTRL
24
DATA
2
CLK
VCC_PLL_1
LATCH_ENABLE
BIAS_RES
VCC_INTERFACE
25
VCC_LD
1
VCC_VCO_CORE
LD_OUT
S1157
Q–
Q+
I–
I+
REF
Figure 1. SKY74068-21 Transmitter Pinout – 32-Pin RFLGA (5 x 5 mm)
(Top View)
LD_OUT
Fractional-N/
Integer-N PLL
0O
CP
PCS_OUT
90
O
LO Generation
VCO_IO
90O
CELL_OUT–
Serial I/O
CELL_OUT+
0O
GAIN_CTRL
DATA
CLK
LATCH_ENABLE
Integrated
VCO Tank
S347
Figure 2. SKY74068-21 Transmitter Block Diagram
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DATA SHEET • SKY74068-21 CDMA TRANSMITTER
Technical Description
Serial Bus Interface
Baseband Filter
A three-wire serial bus with read/write capability provides mode
and bias control, and control of the PLL. The serial interface
consists of three signals: a bus clock (CLK), a bus enable
(LATCH_ENABLE), and the serial, bi-directional data line (DATA).
The SKY74068-21 has two modes of operation: current and
voltage. In current mode, the device consists of a low resistive
input. Together with an external capacitor across the differential
inputs, the low resistive input acts as a low-pass filter.
In voltage mode operation, the baseband section of the
SKY74068-21 contains a simple RC filter to reject receive band
noise from incoming I and Q signals.
VCO, LO Chain, and PLL
The VCO has an internal tank circuit automatically tuned to the
desired frequency. The VCO is connected to an on-chip PLL and
LO generation blocks. The output of the LO generation blocks
drives the LO port of the I/Q RF upconverter.
A dual-mode fractional-N/integer-N PLL is used to lock the VCO to
the desired frequency in CDMA mode. A bi-directional buffer is
available to measure the VCO output or to enable use of an
external LO for testing purposes.
I/Q RF Upconverter
The I/Q RF upconverter converts the incoming I/Q signal to the
desired RF output signal. The upconverter passes the output
signal directly to the variable gain PA drivers. The LO for the
upconverter is provided by the VCO and LO generation blocks.
The upconverter block consists of two separate mixers, one for
cellular mode operation and the other for PCS mode. The output
of the PCS mixer is routed to the PCS PA driver and the cellular
mixer output is routed to the cellular PA driver.
Variable Gain PA Drivers
The SKY74068-21 includes two PA drivers. These drivers control
the power level of the signal provided by the PCS and cellular
upconverters. The gain of both drivers is variable, yielding over
75 dB of dynamic range.
Package and Handling Information
Since the device package is sensitive to moisture absorption, it is
baked and vacuum packed before shipping. Instructions on the
shipping container label regarding exposure to moisture after the
container seal is broken must be followed. Otherwise, problems
related to moisture absorption may occur when the part is
subjected to high temperature during solder assembly.
The SKY74068-21 is rated to Moisture Sensitivity Level 3 (MSL3)
at 260 C. It can be used for lead or lead-free soldering. For
additional information, refer to the Skyworks Application Note,
PCB Design & SMT Assembly/Rework Guidelines for RFLGA
Packages, document number 103147.
Care must be taken when attaching this product, whether it is
done manually or in a production solder reflow environment.
Production quantities of this product are shipped in a standard
tape and reel format.
Electrical and Mechanical Specifications
Signal pin assignments and functional pin descriptions are
described in Table 1. The absolute maximum ratings of the
SKY74068-21 are provided in Table 2. The recommended
operating conditions are specified in Table 3 and electrical
specifications are provided in Table 4.
An application schematic diagram for the SKY74068-21 is shown
in Figure 3. The package dimensions for the 32-pin RFLGA are
shown in Figure 4, and the tape and reel dimensions are provided
in Figure 5.
The PCS driver output is single-ended, while the cellular driver is
differential. Both are open collector outputs that require external
matching.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET • SKY74068-21 CDMA TRANSMITTER
Table 1. SKY74068-21 Signal Descriptions
Pin #
Name
Description
Pin #
Name
Description
1
LD_OUT
Lock detect output. Open drain.
17
VCC_RF_1
Supply for bias circuits of all drivers.
2
VCC_PLL_1
Supply for the PLL.
18
TX_ENABLE
Transmit enable/disable pin for all blocks,
excluding VCO and PLLs.
3
N/C
No connection
19
CELL_OUT+
Positive cellular driver differential output.
4
CP
Charge pump output.
20
CELL_OUT–
Negative cellular driver differential output.
5
VCC_PLL_2
Supply for the PLL.
21
VCC_RF_2
Supply for PCS and cellular output drivers.
6
VCO_IO
Input/output port for the VCO bidirectional buffer.
22
PCS_OUT
PCS driver output.
7
VCO_TUNE
Loop filter input for the VCO.
23
VCC_RF_3
Supply for bias circuits of the PCS
differential driver.
8
VCO_EXT_RES
External bias-setting resistor for the VCO.
24
VCC_RF_4
Supply for the mixer and associated bias
blocks.
9
VCO_BYPASS
External capacitor for VCO noise filtering.
25
BIAS_RES
External bias resistor for all blocks,
excluding VCO.
10
VCC_VCO_CORE
Supply for the VCO.
26
CS
Current sink.
11
VCC_LO
Supply for LO generation blocks.
27
Q+
Positive quadrature analog baseband
input.
12
VCC_INTERFACE
Supply for serial bus.
28
Q–
Negative quadrature analog baseband
input.
13
CLK
Clock signal for serial bus.
29
I+
Positive in-phase analog baseband input.
14
LATCH_ENABLE
Latch enable signal for serial bus.
30
I–
Negative in-phase analog baseband input.
15
DATA
Data signal for serial bus.
31
VCC_CLK
Supply for the TCXO buffer.
16
GAIN_CTRL
Gain control voltage.
32
REF
TCXO input.
Table 2. SKY74068-21 Absolute Maximum Ratings
Maximum
Units
Supply voltage (VCC)
Parameter
–0.3
+3.6
V
Input voltage range
–0.3
VCC
V
Storage temperature
–40
+125
C
Ambient operating temperature
–30
+85
C
Note:
Symbol
Minimum
Typical
Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other
parameters set at or below their nominal value.
CAUTION: Although this device is designed to be as robust as possible, Electrostatic Discharge (ESD) can damage this device. This device
must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the human body
or equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all times.
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DATA SHEET • SKY74068-21 CDMA TRANSMITTER
Table 3. SKY74068-21 Recommended Operating Conditions
Parameter
Symbol
Supply voltage
Logic level:
high
low
Minimum
Typical
Maximum
Units
2.70
2.85
3.00
V
VCC
0.5
V
V
VCC – 0.5
0
ZIN of logic control inputs
50
k
Supply current:
CDMA mode @ 5 dBm
PCS mode @ 5 dBm
71
76
mA
mA
Supply current in sleep mode
A
100
Table 4. SKY74068-21 Electrical Specifications (Note 1) (1 of 3)
(TA = +25 C, VCC = 2.85 V, CDMA2000 Waveform Used Unless Otherwise Noted)
Parameter
Symbol
Test Condition
Min
Typical
Max
Units
Baseband Filter
Cutoff frequency
3
MHz
Amplitude ripple
0.5
Amplitude imbalance between I and Q
chains
0.20
dB
0.25
dB
Phase imbalance between I and Q chains
1
degrees
Rejection:
@ 45 MHz (CDMA)
@ 80 MHz (PCS)
20
25
dB
dB
1
Vp-p
differential
I/Q RF Upconverter, Voltage Mode
Input signal level
Input common mode voltage
1.3
Input impedance
1.5
1.9
V
50
k
1  0.6
mA
I/Q Upconverter, Current Mode
Input signal level
Current sink
20
200
A
2.5
MHz
I/Q RF Upconverter and Driver, CDMA
I/Q frequency range
0.63
–1 dB bandwidth
5
RF output frequency range
800
Maximum RF output power
950
+5
Dynamic range
75
Control voltage range
0.2
Slope of RF AGC
30
ACPR:
750 kHz offset @ +4 dBm
1.98 MHz offset @ +0 dBm
836
MHz
MHz
dBm
dB
50
2.7
V
75
dB/V
–55
–70
dBc
dBc
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DATA SHEET • SKY74068-21 CDMA TRANSMITTER
Table 4. SKY74068-21 Electrical Specifications (Note 1) (2 of 3)
(TA = +25 C, VCC = 2.85 V, CDMA2000 Waveform Used Unless Otherwise Noted)
Parameter
Symbol
Test Condition
Min
Typical
Max
Units
I/Q RF Upconverter and Driver, CDMA (continued)
Residual sideband suppression
–38
–35
dBc
Carrier suppression (Note 2)
–35
–32
dBc
0.5
1.0
dB
Gain variation over the frequency band
824 MHz to 849 MHz
Output return loss @ maximum power
–12
–10
dB
Receive band noise @ maximum gain,
Po = +8 dBm
–137
–135
dBm/Hz
Noise floor @ minimum controlled output
power = –81 dBm/1.23 MHz
–165
–160
dBm/Hz
Supply current including LO chain:
Current mode @ minimum power
Current mode @ –30 dBm
Current mode @ +8 dBm
26
40
60
30
46
69
mA
mA
mA
Supply current including LO chain:
Voltage mode @ minimum power
Voltage mode @ –20 dBm
Voltage mode @ +8 dBm
22
35
60
25
40
69
mA
mA
mA
Settling time for output power to reach
1 dB of final value
s
5
I/Q RF Upconverter and Driver, PCS
I/Q frequency range
0.63
–1 dB bandwidth
2.5
MHz
2000
MHz
5
RF output frequency range
1700
Maximum RF output power
1880
MHz
+5
RF dynamic range
75
Control voltage range
0.2
Slope of RF AGC
30
dBm
dB
50
2.7
V
80
dB/V
ACPR:
885 kHz @ +1 dBm
1.25 MHz offset @ +1 dBm
1.98 MHz offset @ +2 dBm
–52
–55
–70
Residual sideband suppression
–35
–35
dBc
Carrier suppression (Note 2)
–35
–32
dBc
Output return loss @ maximum power
–12
–10
Receive band noise @ maximum gain,
Po = +5 dBm
–134
Noise floor @ minimum controlled output
power = –79 dBm/1.23 MHz
–165
dBc
dBc
dBc
–160
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6
dB
dBm/Hz
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dBm/Hz
DATA SHEET • SKY74068-21 CDMA TRANSMITTER
Table 4. SKY74068-21 Electrical Specifications (Note 1) (3 of 3)
(TA = +25 C, VCC = 2.85 V, CDMA2000 Waveform Used Unless Otherwise Noted)
Parameter
Symbol
Test Condition
Min
Typical
Max
Units
Supply current including LO chain:
Current mode @ minimum power
Current mode @ –30 dBm
Current mode @ +9 dBm
23
40
64
26
46
72
mA
mA
mA
Supply current including LO chain:
Voltage mode @ minimum power
Voltage mode @ –30 dBm
Voltage mode @ +5 dBm
19
40
66
23
46
76
mA
mA
mA
I/Q RF Upconverter and Driver, PCS (continued)
Settling time for output power to reach
1 dB of final value
s
5
VCO/PLL in CDMA Mode
Phase noise:
@ 100 kHz offset
@ 885 kHz offset
@ 1.98 MHz offset
–100
–120
–130
Total supply current
–95
–110
–120
5.5
dBc/Hz
dBc/Hz
dBc/Hz
mA
Fractional-N PLL
Reference range
1.0
Reference input sensitivity
19.2
40.0
MHz
200
500
Charge pump current, RF (sel 1)
0.032
0.040
0.048
mA
Charge pump current, RF (sel 2)
0.08
0.10
0.12
mA
Charge pump current, RF (sel 3)
0.16
0.20
0.24
mA
Charge pump current, RF (sel 4)
0.32
0.40
0.48
mA
0.10
nA
Charge pump leakage current
PLL phase noise integrated from 1 kHz to
630 kHz at carrier:
CDMA (Fcomp = 9.6 MHz)
PCS (Fcomp = 9.6 MHz)
mVp-p
Unity gain loop
bandwidth = 25 kHz
Supply current
2
2
degrees rms
degrees rms
4
mA
Integer-N PLL
Input frequency minimum range
500
Reference range
1.0
19.2
2500
MHz
40.0
MHz
Phase detector frequency minimum range
10
Reference input sensitivity
200
500
Charge pump current, RF (sel 1)
0.22
0.28
0.34
mA
Charge pump current, RF (sel 2)
0.56
0.70
0.84
mA
Charge pump current, RF (sel 3)
1.12
1.40
1.68
mA
Charge pump current, RF (sel 4)
2.24
2.80
3.36
mA
Charge pump output voltage compliance,
minimum range
0.5
VDD – 0.5
V
Supply current
1000
kHz
mVp-p
3.5
mA
Note 1: Performance is guaranteed only under the conditions listed in this Table.
Note 2: Minimum of –20 dBc at minimum power.
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R1
5.1 Ω
C1
1 nF
C15
33 pF
C22
470 pF
R8
2.2 kΩ
R6
1.5 kΩ
C20
470 pF
Note: Capacitors C8 and C9 are used only in the current operation mode.
INTERFACE_VCC
PLL_VCC
PLL_VCC
LD_OUT
X
R4
5.1 Ω
R5
10 Ω
C18
10 nF
C12
1 nF
×
9
8
7
6
5
4
3
2
1
C11
100 pF
C14
1 nF
C17
1 nF
VCO_BYPASS
VCO_EXT_RES
VCO_TUNE
VCO_IO
VCC_PLL_2
CP
N/C
VCC_PLL_1
LD_OUT
32
11
REF
VCC_VCO_CORE
10
31
30
29
28
12
13
14
27
15
SKY74068-21
VCC_CLK
VCC_LD
R20
10 kΩ
DATA
PLL_VCC
I–
VCC_INTERFACE
C13
100 pF
Q+
TCXO
R3
10 Ω
26
16
VCC_RF_2
PCS_OUT
VCC_RF_3
VCC_RF_4
BIAS_RES
VCC_RF_1
TX_ENABLE
CELL_OUT+
CELL_OUT–
CS
GAIN_CTRL
TX_I–
I+
CLK
17
18
19
20
21
22
23
24
25
R2
30 kΩ
C4
33 pF
C3
33 pF
1
L3
15 nH
4
6
L2
15 nH
C10
0.33 μF
C7
8.2 pF
C2
8.2 pF
L1
12 nH
2
4
Out
In–
In+
3
C6
33 pF
1
5
2
3
C5
0.1 μF
Out
Cellular RF SAW
In
PCS RF SAW
C8
330 pF
GND
GND
Q–
LATCH_ENABLE
GND
C9
330 pF
GND
8
GND
TX_I+
CLK
LE
DATA
TX_AGC
TX_VCC
PA_ON
TX_VCC
S1158
CELL_OUT
TX_VCC
PCS_OUT
TX_VCC
CURRENT_SINK
TX_Q+
TX_Q–
DATA SHEET • SKY74068-21 CDMA TRANSMITTER
Figure 3. SKY74068-21 Application Schematic
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DATA SHEET • SKY74068-21 CDMA TRANSMITTER
B
5.04
2.47
C
Pin 1
Indicator
Pin 1 Indicator
0.5 Pitch
5.04
32x SMT Pad
0.15 A B C
2.47
0.15
∅2 ± 0.05
Solder Mask Opening
0.2 A B C
A
A
1 ± 0.1
A B C
0.1
Top View
Side View
Bottom View
(2X R0.05)
0.38 ± 0.1
0.38 ± 0.1
0.05
0.3 ± 0.05
0.4 ± 0.05
Detail A
SMT Pad
Scale: 3X
7X This Rotation
7X Rotated 180°
9X Rotated 90° CW
9X Rotated 90° CCW
All measurements are in millimeters
Dimensioning and tolerancing according to ASME Y14.5M-1994
S1841
Figure 4. SKY74068-21 32-Pin RFLGA Package Dimension Drawing
8.00 (P1)
1.55 ± 0.05
4.00 (P0)
2.00 ± 0.05
0.30 ± 0.05
B
1.75 ± 0.10
5.35 (Bo)
A
5o Max.
12.00 ± 0.30
A
5.50 ± 0.05
Pin #1
Indicator
B
1.50 Min.
1.30 (Ko)
5.35
B
5o Max.
Notes:
1. Carrier tape: black conductive polystyrene
2. Cover tape material: transparent conductive PSA
3. Cover tape size: 9.3 mm width 10
4. ESD surface resistivity is ≤1 x 10 Ohms/Square
according to EIA, JEDIC TNR specification.
5. P0/P1 10 pitches cumulative tolerance on tape: ±0.20 mm
6. A and B measurement points are 0.30 mm from bottom pocket.
7. All dimensions are in millimeters
A
S461
Figure 5. SKY74068-21 Tape and Reel Dimensions
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DATA SHEET • SKY74068-21 CDMA TRANSMITTER
Ordering Information
Model Name
SKY74068-21 Transmitter
Manufacturing Part Number
SKY74068-21
Evaluation Board Part Number
*** TBD ***
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applications assistance, customer product design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters.
Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands
and names are for identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com,
are incorporated by reference.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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August 2, 2010 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200761B