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PDF SKY74068-21 Data sheet ( Hoja de datos )
| Número de pieza | SKY74068-21 | |
| Descripción | Dual-Band Transmitter | |
| Fabricantes | Skyworks Solutions | |
| Logotipo |  |
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DATA SHEET
SKY74068-21: Dual-Band Transmitter for CDMA and PCS
Femtocell Applications
Applications
Dual-band femtocells
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.
Description
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.
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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
200761B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • August 2, 2010
1
Free Datasheet http://www.datasheet-pdf.com/
1 page  
DATA SHEET • SKY74068-21 CDMA TRANSMITTER
Table 3. SKY74068-21 Recommended Operating Conditions
Parameter
Symbol
Supply voltage
Logic level:
high
low
ZIN of logic control inputs
Supply current:
CDMA mode @ 5 dBm
PCS mode @ 5 dBm
Supply current in sleep mode
Minimum
2.70
VCC – 0.5
0
Typical
2.85
50
71
76
Maximum
3.00
VCC
0.5
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
Baseband Filter
Cutoff frequency
Amplitude ripple
Amplitude imbalance between I and Q
chains
Phase imbalance between I and Q chains
Rejection:
@ 45 MHz (CDMA)
@ 80 MHz (PCS)
I/Q RF Upconverter, Voltage Mode
Input signal level
Min
3
Input common mode voltage
Input impedance
I/Q Upconverter, Current Mode
Input signal level
Current sink
I/Q RF Upconverter and Driver, CDMA
I/Q frequency range
–1 dB bandwidth
RF output frequency range
Maximum RF output power
Dynamic range
Control voltage range
Slope of RF AGC
ACPR:
750 kHz offset @ +4 dBm
1.98 MHz offset @ +0 dBm
1.3
20
800
75
0.2
30
Typical
0.5
0.20
1
20
25
1
1.5
50
1 0.6
0.63
5
836
+5
50
–55
–70
Max
0.25
1.9
200
2.5
950
2.7
75
Units
V
V
V
k
mA
mA
A
Units
MHz
dB
dB
degrees
dB
dB
Vp-p
differential
V
k
mA
A
MHz
MHz
MHz
dBm
dB
V
dB/V
dBc
dBc
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
200761B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • August 2, 2010
5
Free Datasheet http://www.datasheet-pdf.com/
5 Page | ||
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