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Электронный компонент: CX74037

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Data Sheet
Conexant Proprietary
Doc. No. 101103A
Data Subject to Change
September 27, 2000
CX74037
Transmit RF IC for TDMA or AMPS Applications
Conexant's CX74037 Transmit RF Application-Specific Integrated Circuit (ASIC) is
a triple-mode, dual-band transmitter intended for use in IS-136 compliant cellular
phones. As a dual mode IC, it can be used in Time Division Multiple Access
(TDMA) mode or Advanced Mobile Phone System (AMPS) mode. The device is
available in a 48-pin 7x7 Land Grid Array (LGA) package with downset paddle.
The CX74037 RF IC device includes the following functional components:
In-Phase and Quadrature (I/Q) modulator
Two Intermediate Frequency (IF) Voltage Controlled Oscillator (VCO) inputs
IF Variable Gain Amplifier (VGA)
Two upconverters
Two drivers for external Power Amplifiers (PAs).
The CX74037 48-pin, 7x7 LGA package pin configuration is shown in Figure 1. A
CX74037 block diagram is shown in Figure 2.
Features
Sectional enable lines for independent control of
circuits within the chip
90 dB IF VGA range
Separate IF frequencies can be used for the 800
MHz (AMPS) and 1900 MHz Bands (PCS)
Dual drivers for 800 MHz and 1900 MHz
PA driver is deactivated by using the Driver Enable
signal when there is no transmission
Available in a 48-pin, 7x7 LGA package with
downset paddle
Applications
Cellular and/or PCS-band phones
TDMA and/or AMPS-mode phones
Portable battery powered equipment
101103A-1_080400
N C
I F _ V C O _ I N 1 -
I F _ V C O _ I N 1 +
N C
N C
N C
V C C _ D I V
M I X _ C E L L _ O U T
P U L L _ E N A
V C C _ D I F F _ D R V
M I X _ P C S _ O U T
N C
N C
VGA_EN
LO_CELL
VCC_MIX
LO_PCS_IN
NC
NC
IF_SELECT
IF_VCO_IN2-
IF_VCO_IN2+
MODE
NC
M I X _ I N +
M I X _ I N -
V C C _ I F
V G A _ G C
V G A _ O U T -
V G A _ O U T +
V C C _ L D _ P C S
P O T _ C E L L
D R V _ E N A
R F _ P C S _ O U T
V C C _ B I A S
R F _ C E L L _ O U T
B A N D
VCC_DRV_CEL
POT_PCS
VCC_MID_PCS
DRV_CELL_IN
DRV_PCS_IN
I_DATA+
I_DATA-
VCC_MOD
Q_DATA+
Q_DATA-
NC
1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
1 3
3 5
3 4
3 3
3 2
3 1
3 0
2 9
2 8
2 7
2 6
2 5
3 6
3 7
4 5
4 6
4 7
4 8
4 4
4 3
4 2
4 1
4 0
3 9
3 8
1 7
1 6
1 5
1 4
1 8
1 9
2 0
2 1
2 2
2 3
2 4
Figure 1. CX74037 48-Pin, 7x7 LGA Package Pin Configuration
CX74037
Transmit RF IC for TDMA or AMPS Applications
Data Sheet
Conexant Proprietary
Doc. No. 101103A
Data Subject to Change
September 27, 2000
PCS-TDMA
RF Out
Cell RF Out
PCS RF SAW
TX RFIC
CX74037
Cell LO
Cell RF SAW
PCS LO
LPF or BPF
2
IF LO IN
Vvga
101103A-2_080900
2
2
VCC
I Data
Q Data
Interface
VGA En
PA Driver En
PULL En
Band Select
IF Select
Figure 2. CX74037 Functional Block Diagram
Technical Description
The CX74037 is a TDMA transmitter for the 800 MHz and 1900
MHz bands. It also can be used as an FM transmitter in AMPS
mode at the 800 MHz band. A band select command chooses
between the 800 MHz band and the 1900 MHz band. A mode
select command chooses between TDMA and AMPS mode.
The chip consist of an I/Q modulator, IF LO input buffer, IF VGA,
two upconverters for the 800 MHz and 1900 MHz bands, and
two PA drivers for the 800 MHz and the 1900 MHz bands.
I/Q Modulator. The I/Q modulator converts the incoming I/Q
signal to an IF signal using one of the two local oscillator inputs.
This signal is fed directly to the VGA amplifier.
Variable Gain Amplifier. The VGA is a differential amplifier that
receives its signal from the I/Q modulator, amplifies it, and then
is taken off-chip to be filtered before routing it to the
upconverter. A dynamic range of 90 dB is available on the
amplifier. A DC voltage of 0.2 to 2.5 V is needed to control the
gain of the amplifier.
Upconverters. The 800 MHz and 1900 MHz upconverters
receive the IF signal from the VGA amplifier. Each upconverter
requires an external LO controlled by an external Phase Locked
Loop (PLL). The band select command switches between the
800 MHz and the 1900 MHz bands.
PA Drivers. Two PA drivers are included, the 800 MHz driver
and the 1900 MHz driver. Each driver takes its input from the
upconverter after passing through an image rejection filter. The
driver amplifies the signal and sends it to an external PA.
Electrical and Mechanical Specifications ________________
The signal pin assignments and functional pin descriptions are
found in Table 1. The absolute maximum ratings of the
CX74037 are provided in Table 2, the recommended operating
conditions are specified in Table 3. Electrical characteristics for
the CX74037 are shown in Table 4. Table 5 defines the control
signal logic.
Figure 3 provides the package dimensions for the 48-pin, 7x7
LGA package.
ESD Sensitivity
The CX74037 is a static-sensitive electronic device. Do not
operate or store near strong electrostatic fields. Take proper
ESD precautions.
Transmit RF IC for TDMA or AMPS Applications
CX74037
101103A
Conexant Proprietary
3
September 27, 2000
Data Subject to Change
Table 1. CX74037 Signal Definition (1 of 2)
Pin NO.
Name
Description
1
Mix_IN+
Input to RF Upconverters. Internally AC coupled, high impedance.
2
Mix_IN-
Input to RF Upconverters. Internally AC coupled, high impedance.
3
VCC_IF
Supply voltage for the AGC amplifier.
4
VGA_GC
The input pin for AGC gain control. A DC control voltage should be applied to this pin to vary the gain of the IF amplifier.
5
VGA_OUT-
VGA Output, open collector. External resistive (300 ohms) pull up to Vcc required.
6
VGA_OUT+
VGA Output, open collector. External resistive (300 ohms) pull up to Vcc required.
7
VCC_LD_PCS
Supply voltage for the PCS last stage driver amplifier.
8
POT_CELL
This pin is connected to an external resistor. The value of the resistor will vary the bias current of the cellular driver.
9
DRV_ENA
This is the input pin for the upconverter and the driver control signal. When the pin is low the driver and the upconverter are
deactivated.
10
RF_PCS_OUT
Output pin for the PCS driver amplifier. Impedance matching is required.
11
VCC_BIAS
Supply voltage of bias cells.
12
RF_CELL_OUT
Output pin for the cellular driver amplifier. Impedance matching is required.
13
BAND
This is a control signal input pin. It selects between cellular band and PCS band. When the input is low, the cellular band is chosen.
When the input is high, the PCS band is chosen.
14
VCC_DRV_CEL
Supply voltage for the driver of the cellular band.
15
POT_PCS
This pin is connected to an external resistor. The value of the resistor will vary the bias current of the PCS driver.
16
VCC_MID_PCS
Supply voltage for the first amplifier in the PCS driver block.
17
DRV_CELL_IN
The Cellular driver amplifier input pin. Impedance matching is required.
18
DRV_PCS_IN
The PCS driver amplifier input pin. Impedance matching is required.
19
I_DATA+
The baseband input for I channel. This is a balanced input. A DC bias has to be supplied to the pin.
20
I_DATA-
Same as pin 20, except complementary input. This pin should be pull low (0 V) in FM mode.
21
VCC_MOD
Supply voltage for the I/Q modulator.
22
Q_DATA+
The baseband input for Q channel. This is a balanced input. A DC bias has to be supplied to the pin.
23
Q_DATA-
Same as pin 23, except complementary input.
24
NC
There is no connection on this pin. Should be tied to ground.
25
NC
There is no connection on this pin. Should be tied to ground.
26
NC
There is no connection on this pin. Should be tied to ground.
27
MIX_PCS_OUT
Output of the PCS upconverter. Impedance matching required.
28
VCC_DIFF_DRV
Supply voltage for a differential amplifier in the upconverter block.
29
PULL_ENA
This is a control signal input pin. When the input is low, the IF VCOs, RF Mixer and buffers, and divide by 2 sections will be
disabled. When the input is high, the mentioned sections will be enabled.
30
MIX_CELL_OUT
Output of the Cellular upconverter. Impedance matching required.
31
VCC_DIV
Supply voltage for the dividers and VCO buffer.
32
NC
There is no connection on this pin. Should be tied to ground.
33
NC
There is no connection on this pin. Should be tied to ground.
34
NC
There is no connection on this pin. Should be tied to ground.
35
IF VCO IN1+
Input pin for the modulator LO signal. The frequency is 2xIF. Can be used single-ended. AC ground the unused pin.
36
IF VCO IN1-
Input pin for the modulator LO signal. The frequency is 2xIF. Can be used single-ended. AC ground the unused pin.
37
NC
There is no connection on this pin. Should be tied to ground.
38
NC
There is no connection on this pin. Should be tied to ground.
39
MODE
This is a control signal input pin. When the input is low, the AMPS mode is selected. If the input is high, TDMA mode is selected. FM
output is 9 dB higher at the modulator output.
40
IF VCO IN2+
Input pin for the modulator LO signal. The frequency is 2xIF. Can be used single-ended. AC ground the unused pin.
41
IF VCO IN2-
Input pin for the modulator LO signal. The frequency is 2xIF. Can be used single-ended. AC ground the unused pin.
42
IF_SELECT
Control signal to select IF VCO INPUT1 or INPUT2. "1" will select IF VCO INPUT1 and "0" will select IF VCO INPUT2.
CX74037
Transmit RF IC for TDMA or AMPS Applications
4
Conexant Proprietary
101103A
Data Subject to Change
September 27, 2000
Table 1. CX74037 Signal Definition (2 of 2)
Pin No.
Name
Description
43
NC
Connect to ground.
44
NC
Connect to ground.
45
LO_PCS_IN
This is the input pin for the local oscillator for the PCS band. It is internally matched.
46
VCC_MIX
Supply voltage for the mixer in the upconverter block and for the LO buffer.
47
LO_CELL
This is the input pin for the local oscillator for the cellular band. It is internally matched.
48
VGA_EN
This is a control signal input pin. When the input is low, the VGA and I/Q Modulator sections will be disabled. When the input is high,
the mentioned sections will be enabled.
Table 2. Absolute Maximum Ratings
Parameter
Symbol
Minimum
Typical
Maximum
Units
Supply voltage
VCC
0.3
+5.0
V
Input voltage range
0.3
VCC
V
Power dissipation
600
mW
Ambient operating temperature
30
+80
C
Storage temperature
40
+125
C
Table 3. CX74037 Recommended Operating Conditions
Parameter
Symbol
Minimum
Typical
Maximum
Units
Supply voltage
2.7
3.0
3.6
V
Logic level high
1.9
V
Logic level low
0.8
V
Supply current in 800 MHz TDMA @ 7 dBm
75
mA
Supply current in 800 MHz AMPS @ 7 dBm
75
mA
Supply current in 800 MHz (DRV_ENA off)
45
mA
Supply current in 1900 MHz TDMA @ 8.0 dBm
84
mA
Supply current in 1900 MHz TDMA (DRV_ENA off)
48
mA
Supply current in sleep mode
20
A
Transmit RF IC for TDMA or AMPS Applications
CX74037
101103A
Conexant Proprietary
5
September 27, 2000
Data Subject to Change
Table 4. CX74037 Electrical Characteristics (1 of 3)
VCC
= 3.0 V, T
A
= 25
o
C, PLO = 10 dBm, input externally matched
Parameter
Symbol
Test Conditions
Min
Typical
Max
Units
IF VCO Input
Input frequency range (2X IF frequency)
100
640
MHz
Input signal level
10
3
+3
dBm
I/Q Modulator (Output Not Measurable)
Input voltage level, differential
1.4
Vp-p
Common mode input voltage level
1.4
1.85
2.1
V
Input DC offset
4
mV
Input impedance
100K
Gain variation over process, temperature,
VCC
0.4
dB
I/Q gain mismatch
0.3
0.4
dB
I/Q phase imbalance
2
4
degrees
Transmit VGA
VGA frequency range (1 dB bandwidth)
50
320
MHz
VGA gain (with a 600
differential load):
Maximum
Minimum
22
64
24
62
26
60
dB
dB
VGA gain variation with VCC 3.0 to 3.6 V @
VCTRL 2 V
3
+3
dB
Gain variation with temperature
1.0
+1.0
dB
Gain control input impedance
40K
VGA gain slope
45
50
55
dB/V
VGA gain control range
0.5
2.5
V
Gain slope variation over any 6 dB segment
3
+3
dB/V
Output power level @ 20 dB gain
13
dBm
P1dB @ 22 dB gain
3
dBm
NF @ 22 dB gain
6
dB
NF at -52 dB gain
52
53
dB
Operating temperature range
30
+25
+80
C
Cellular Upconverter
LO frequency range
1017
1043
MHz
LO input return loss (reference to 50
)
10
dB
Output frequency
824
849
MHz
Output return loss from 824 MHz to 849 MHz
(reference to 50
)
15
dB
Conversion gain
7
8
9
dB
Gain degradation @ VCC 2.7 V
0.1
dB
ACPR in 30 kHz at 30 kHz offset @ 5 dBm
output; cascaded
33
dBc
ACPR in 30 kHz at 60 kHz offset @ 5 dBm
output; cascaded
56
dBc
CX74037
Transmit RF IC for TDMA or AMPS Applications
6
Conexant Proprietary
101103A
Data Subject to Change
September 27, 2000
Table 4. RF150 Electrical Characteristics (2 of 3)
V
DD
= 2.7 V, 40
o
C < T
A
< +85
o
C, unless specified
Parameter
Symbol
Test Conditions
Min
Typical
Max
Units
Cellular Upconverter (continued)
Output P1dB
2
3
dBm
Noise figure @ 8 dB gain
12
13
dB
LO to RF leakage @ maximum gain,
LO = 10 dBm
35
dBm
Operating temperature range
30
+25
+80
C
PCS Upconverter
LO frequency range
2078
2139
MHz
LO input return loss (reference to 50
)
10
dB
Output frequency
1850
1910
MHz
Conversion gain
8
9
10
dB
ACPR in 30 kHz at 30 kHz offset @ 4 dBm
output; cascaded
33
dBc
ACPR in 30 kHz at 60 kHz offset @ 4 dBm
output; cascaded
57
dBc
Noise figure @ 9 dB gain
9
10
dB
P1dB
0
dBm
LO to RF leakage @ maximum gain,
LO = 15 dBm
35
dBm
Operating temperature range
30
+25
+80
C
Cellular PA Driver
Output frequency
824
849
MHz
Gain
13
14
15
dB
Output power level @ 14 dB gain
7
dBm
Input return loss (reference to 50
)
15
dB
Output P1dB
14.5
dBm
ACPR in 30 kHz band at 30 kHz offset @ 7
dBm output; cascaded
32
dBc
ACPR in 30 kHz band at 60 kHz offset @ 7
dBm output; cascaded
55
dBc
Output return loss (reference to 50
)
15
dB
Noise figure
6
8
dB
Operating temperature range
30
+25
+80
C
External bias resistor value for +14.5 dBm
P1dB
120
Transmit RF IC for TDMA or AMPS Applications
CX74037
101103A
Conexant Proprietary
7
September 27, 2000
Data Subject to Change
Table 4. RF150 Electrical Characteristics (3 of 3)
V
DD
= 2.7 V, 40
o
C < T
A
< +85
o
C, unless specified
Parameter
Symbol
Test Conditions
Min
Typical
Max
Units
PCS PA Driver
Input return loss (reference to 50
)
15
dB
Output frequency
1850
1910
MHz
Gain
15
16
17
dB
Output power level @ 16 dB gain
8.0
dBm
Output P1dB
14
dBm
ACPR in 30 kHz band at 30 kHz offset @ 8.0
dBm output; cascaded
32
dBc
ACPR in 30 kHz band at 60 kHz offset @ 8.0
dBm output; cascaded
55
dBc
Output return loss (reference to 50
)
15
dB
Noise figure
9
10
dB
Operating temperature range
30
+25
+80
C
External bias resistor value for +16 dBm of
P1dB
130
Table 5. Control Signal Truth Table
Signal Name
Logic 1
Logic 0
Remark
VGA_ENA
ON
OFF
DRV_ENA
ON
OFF
Cell and PCS band
BAND
PCS
Cell
PULL_ENA
ON
OFF
IF VCO, RF mixer buffers, divide-by-2
IF_Select
IF VCO IN1
IF VCO IN2
MODE
TDMA
FM
In FM mode:
Normal DC bias on I+,
0 V bias on I
CX74037
Transmit RF IC for TDMA or AMPS Applications
8
Conexant Proprietary
101103A
Data Subject to Change
September 27, 2000
C924
Top View
Side View
All dimensions are in millimeters
Bottom View
7.00 0.10
7.00 0.10
1.20 0.10
Mold
Substrate
0.30 0.05
0.300 0.05
0.355 0.05
0.500
3.450
3.450
Exposed Metal
Solder Mask
Pin 1
indication
R2.225
Pin 1
Figure 3. CX74037 Package Dimensions for a 48-Pin, 7x7 LGA Package
Transmit RF IC for TDMA or AMPS Applications
CX74037
101103A
Conexant Proprietary
9
September 27, 2000
Data Subject to Change
Ordering Information
Model Name
Manufacturing Part
Number
Transmit RF IC
CX74037
2000, Conexant Systems, Inc. All Rights Reserved.
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