CX74037
Transmit RF IC for TDMA or AMPS Applications
Features
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.
• 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
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).
Applications
The CX74037 48-pin, 7x7 LGA package pin configuration is shown in Figure 1. A
CX74037 block diagram is shown in Figure 2.
VGA_EN
LO_CELL
VCC_MIX
LO_PCS_IN
NC
NC
IF_SELECT
IF_VCO_IN2-
IF_VCO_IN2+
MODE
NC
MIX_IN+
• Cellular and/or PCS-band phones
• TDMA and/or AMPS-mode phones
• Portable battery powered equipment
48
47
46
45
44
43
42
41
40
39
38
1
37
NC
MIX_IN-
2
36
IF_VCO_IN1-
VCC_IF
3
35
IF_VCO_IN1+
VGA_GC
4
34
NC
VGA_OUT-
5
33
NC
VGA_OUT+
6
32
NC
VCC_LD_PCS
7
31
VCC_DIV
POT_CELL
8
30
MIX_CELL_OUT
DRV_ENA
9
29
PULL_ENA
RF_PCS_OUT
10
28
VCC_DIFF_DRV
VCC_BIAS
11
27
MIX_PCS_OUT
RF_CELL_OUT
12
26
NC
BAND
13
25
NC
23
24
NC
22
Q_DATA-
21
Q_DATA+
20
I_DATA-
19
VCC_MOD
18
I_DATA+
17
DRV_PCS_IN
16
DRV_CELL_IN
POT_PCS
15
VCC_MID_PCS
VCC_DRV_CEL
14
101103A-1_080400
Figure 1. CX74037 48-Pin, 7x7 LGA Package Pin Configuration
Data Sheet
Conexant Proprietary
Data Subject to Change
Doc. No. 101103A
September 27, 2000
CX74037
Transmit RF IC for TDMA or AMPS Applications
PCS RF SAW
IF LO IN
Cell LO
PCS-TDMA
RF Out
CX74037
VCC
TX RFIC
I Data
÷2
Cell RF Out
2
Interface
PCS LO
IF Select
Band Select
PULL En
PA Driver En
VGA En
Q Data
2
Vvga
Cell RF SAW
101103A-2_080900
LPF or BPF
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.
Data Sheet
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.
Conexant Proprietary
Data Subject to Change
Doc. No. 101103A
September 27, 2000
Transmit RF IC for TDMA or AMPS Applications
CX74037
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.
101103A
September 27, 2000
Conexant – Proprietary
Data Subject to Change
3
CX74037
Transmit RF IC for TDMA or AMPS Applications
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
Maximum
Units
–0.3
+5.0
V
–0.3
VCC
V
600
mW
Ambient operating temperature
–30
+80
°C
Storage temperature
–40
+125
°C
Supply voltage
Symbol
Minimum
VCC
Input voltage range
Typical
Power dissipation
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
Supply current in 800 MHz TDMA @ 7 dBm
75
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
4
V
mA
20
Conexant – Proprietary
Data Subject to Change
µA
101103A
September 27, 2000
Transmit RF IC for TDMA or AMPS Applications
CX74037
Table 4. CX74037 Electrical Characteristics (1 of 3)
VCC = 3.0 V, TA = 25 oC, PLO = –10 dBm, input externally matched
Parameter
Symbol
Test Conditions
Min
Typical
Max
Units
640
MHz
+3
dBm
IF VCO Input
Input frequency range (2X IF frequency)
100
Input signal level
–10
–3
I/Q Modulator (Output Not Measurable)
Input voltage level, differential
1.4
Common mode input voltage level
1.4
1.85
Input DC offset
Input impedance
Vp-p
2.1
V
4
mV
Ω
100K
Gain variation over process, temperature,
VCC
0.4
I/Q gain mismatch
0.3
0.4
dB
2
4
degrees
320
MHz
26
–60
dB
dB
+3
dB
+1.0
dB
I/Q phase imbalance
dB
Transmit VGA
VGA frequency range (–1 dB bandwidth)
50
VGA gain (with a 600 Ω differential load):
Maximum
Minimum
22
–64
VGA gain variation with VCC 3.0 to 3.6 V @
VCTRL 2 V
24
–62
–3
Gain variation with temperature
–1.0
Gain control input impedance
Ω
40K
VGA gain slope
45
VGA gain control range
0.5
Gain slope variation over any 6 dB segment
–3
50
55
dB/V
2.5
V
+3
dB/V
Output power level @ 20 dB gain
–13
dBm
P1dB @ 22 dB gain
–3
dBm
NF @ 22 dB gain
NF at -52 dB gain
Operating temperature range
–30
6
dB
52
53
dB
+25
+80
°C
1043
MHz
849
MHz
–15
dB
9
dB
Cellular Upconverter
LO frequency range
1017
LO input return loss (reference to 50 Ω)
–10
Output frequency
824
Output return loss from 824 MHz to 849 MHz
(reference to 50 Ω)
Conversion gain
7
8
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
101103A
September 27, 2000
Conexant – Proprietary
Data Subject to Change
5
CX74037
Transmit RF IC for TDMA or AMPS Applications
Table 4. RF150 Electrical Characteristics (2 of 3)
VDD = 2.7 V, –40 oC < TA < +85 oC, unless specified
Parameter
Symbol
Test Conditions
Min
Typical
Max
Units
Cellular Upconverter (continued)
Output P1dB
2
3
Noise figure @ 8 dB gain
12
LO to RF leakage @ maximum gain,
LO = –10 dBm
–35
Operating temperature range
–30
+25
dBm
13
dB
dBm
+80
°C
2139
MHz
PCS Upconverter
LO frequency range
2078
LO input return loss (reference to 50 Ω)
–10
Output frequency
1850
Conversion gain
8
9
dB
1910
MHz
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
P1dB
LO to RF leakage @ maximum gain,
LO = –15 dBm
Operating temperature range
–30
10
dB
0
dBm
–35
dBm
+25
+80
°C
849
MHz
Cellular PA Driver
Output frequency
824
Gain
13
Output power level @ 14 dB gain
15
7
Input return loss (reference to 50 Ω)
dB
dBm
–15
Output P1dB
dB
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 Ω)
–15
dB
Noise figure
Operating temperature range
–30
External bias resistor value for +14.5 dBm
P1dB
6
14
6
8
dB
+25
+80
°C
120
Conexant – Proprietary
Data Subject to Change
Ω
101103A
September 27, 2000
Transmit RF IC for TDMA or AMPS Applications
CX74037
Table 4. RF150 Electrical Characteristics (3 of 3)
VDD = 2.7 V, –40 oC < TA < +85 oC, unless specified
Parameter
Symbol
Test Conditions
Min
Typical
Max
Units
1910
MHz
PCS PA Driver
Input return loss (reference to 50 Ω)
–15
Output frequency
1850
Gain
15
16
Output power level @ 16 dB gain
dB
17
8.0
Output P1dB
dB
dBm
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 Ω)
–15
Noise figure
Operating temperature range
–30
10
dB
+25
+80
°C
130
External bias resistor value for +16 dBm of
P1dB
dB
9
Ω
Table 5. Control Signal Truth Table
Signal Name
101103A
September 27, 2000
Logic 1
Logic 0
VGA_ENA
ON
OFF
DRV_ENA
ON
OFF
BAND
PCS
Cell
PULL_ENA
ON
OFF
IF_Select
IF VCO IN1
IF VCO IN2
MODE
TDMA
FM
Remark
Cell and PCS band
IF VCO, RF mixer buffers, divide-by-2
In FM mode:
Normal DC bias on I+,
0 V bias on I–
Conexant – Proprietary
Data Subject to Change
7
CX74037
Transmit RF IC for TDMA or AMPS Applications
7.00 – 0.10
3.450
Pin 1
indication
Pin 1
Solder Mask
R2
.2
25
Exposed Metal
7.00 – 0.10
3.450
0.300 – 0.05
0.500
0.355 – 0.05
Top View
Bottom View
Mold
All dimensions are in millimeters
1.20 – 0.10
Substrate
0.30 – 0.05
C924
Side View
Figure 3. CX74037 Package Dimensions for a 48-Pin, 7x7 LGA Package
8
Conexant – Proprietary
Data Subject to Change
101103A
September 27, 2000
Transmit RF IC for TDMA or AMPS Applications
CX74037
Ordering Information
Model Name
Transmit RF IC
101103A
September 27, 2000
Manufacturing Part
Number
CX74037
Conexant – Proprietary
Data Subject to Change
9
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