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BT1074BI
850-950MHz RF TRANSCEIVER
SINGLE CHIP 850-950MHz RF TRANSCEIVER
Features
* * * * * * * * Complete single chip RF transceiver Two on-chip local oscillators I/Q or FM* input interface Single power supply 2.7 - 3.6 V Low power consumption BiCMOS technology On-chip LNA and RF Mixer RF Power selectivity (-4dBm or +17dBm) Wide operating temp range (-40oC to +85oC)
MIXERINP GNDRX_BUF 52 MIXOUTP 51 MIXOUTN 50 VDDRX_BUF
54 53
RMX_OUTN GND_IF 55 VCO2_IN
GND_DMX2 GND_DMX1
RMX_OUTP
VDDLNA2
VDDLNA1
VDD_DMX
VDD_IF
59
64
58
61
62
60
57
63
56
GNDLNA1N 1 RF_INN GNDLNA RF_INP
2 3 4
49
RX_EN
48 47 46 45 44 43
RF_VCO_EN VDDRFVCOIN RFVCOCAPIN RF_VCO_CTRL GNDRFVCOIN RF_VCO_OUT GNDRF_VCO VDDRF_VCO VDDIF_VCO GNDIF_VCO
TRFIC
GNDLNA1P 5 VDDPA_GR 6 GND_PA1
7 8
Applications
* * * * * * 902-928 MHz ISM Band 868-870MHz Band (Europe) Direct Sequence Spread Spectrum (DSS) Frequency Hopping Spread Spectrum Wireless LAN Wireless Communication Products
RF_OUTN
BTI
42 41 40 39 38
R
GND_PA2 9 RF_OUTP 10 GND_PA3 11 REXT2 GND_PRE1 REXT1 GND_PRE2
12 13 14 15
BT1074BI
RFICs for 850 - 2400MHz
IF_VCO_OUT GNDIFBUF 36 IFCAPIN
37 34
LEXTN 16 VDD_IFVCOIN 32 TXI 28 M_REF 29 GND_TXIF1 26 VDD_UPC 21 GND_UPC1 22 GND_UPC2 23 GND_TXIF2 27 LEXTP 17 GND_PRE3 18 VDD_PRE2 20 VDD_PRE1 19 TX_P_CNT 24 TX_EN 25 TXQ 30 VDD_TXIF 31
IF_VCO_CTRL GND_IFVCOIN 33 IF_VCO_GND
35
Description
The BT1074BI is a BiCMOS monolithic integrated RF transceiver. In addition to the input I/Q interface, the IC contains all of the required components to implement a complete RF-IF transceiver. This includes two on-chip local oscillators, a low noise amplifier with an overall noise figure of less than 5dB over temperature and power supply variations, two highly linear down-conversion mixers, an IF amplifier, an upconversion mixer and an on-chip power amplifier capable of delivering -4dBm to +17dBm. The unit operates with a power supply voltage range of 2.7 - 3.6 volts.
* See Single-ended RFM input application example on page 15.
Ordering Information
BT1074BI 850-950MHz RF Transceiver BTI, 13825 Cerritos Corporate Dr., Cerritos CA. 90703, U.S.A. Tel (562) 407-0500 Fax (562) 407-0510 sales@betheltronix.com www.betheltronix.com
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Page 1
BT1074BI
Specifications
Parameters Overall Power supply Operating Frequency ranges Receiver Gain Noise Figure Input IP3 Current consumption (w/ RF VCO) Transmitter Gain TX current consumption @ High power mode (with RF & IF VCOs) *with RF PA @ +15 dBm output IFVCO current consumption RFVCO current consumption Receiver Section LNA + RF Downconversion Mixer Gain Input IP3 Input 1dB compression point Noise figure (LNA only) S11 Input impedance1 Output Impedance Image Rejection (at typical center freq.): 915MHz 881.49MHz IF Downconversion Mixer & IF Amp Gain Input IP3 Input 1dB compression point Noise figure Input Impedance Output Impedance Transmitter Section I&Q Modulator & Filter Input impedance I/Q input frequency I/Q input swing I/Q input DC level M_REF DC level 16 -13 -22 2.4 -44 27 26 12 -10 -20 Min. 2.7 890 860 28 3.6 -11 -
850-950MHz RF TRANSCEIVER
Typ. 3.0 915 35 4 -12 60 17 89* 27 32
Max. 3.6 940 875 44 5 -13 -
Units V MHz MHz dB dB dBm mA dB mA mA mA
R
RFICs for 850 - 2400MHz
20 -12 -21 2.8 50 300 29 28 15 -10 -20 300 330
22 -11 -20 3.3 -22 31 30 20 -9 -19 -
dB dBm dBm dB dB dB dB dB dBm dBm
TRFIC
>20 <4 0.5 VDD/2 VDD/2
-
k MHz Vp-p V V
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850-950MHz RF TRANSCEIVER
Parameters RF Upconversion Mixer Conversion gain (internal) Input IP3 Input 1dB compression point Power Amplifier* Output power into 50 load, high power mode (TX_P_CNT=0V) Output power into 50 load, low power mode (TX_P_CNT=VDD) Voltage Gain (internal) Output impedance (after combiner) Output 1dB compression point Output spurious suppression RF VCO Section* Frequency range (at output to PLL) VCO phase noise at 100KHz offset (closed-loop) VCO phase noise at 1MHz offset VCO output level (50) IF VCO Section* Frequency range (at output to PLL) VCO phase noise at 100KHz offset (closed-loop) VCO phase noise at 1MHz offset VCO output level 205 -14 220 -112 -120 -8 235 -2 780 -14 805 -100 -118 -12 830 -6 Min. +13 Typ. 0 -10 -20 +15 -4 25 50 7 -40 Max. +17 -30
BT1074BI
Units dB dBm dBm dBm dBm dB dBm dBm MHz dBc/Hz dBc/Hz dBm MHz dBc/Hz dBc/Hz dBm
TRFIC
R
RFICs for 850 - 2400MHz
* The values in these sections refer to the 902-928MHz application. To use the BT1074B in the 868870MHz band, only the RF VCO, IF VCO, power combiner and LNA RF matching component values need to be changed.
Absolute Maximum Ratings
Parameters
Supply Voltage Power Control Voltage Storage Temperature
Value
7 VDD+0.5 +150
Unit
V V
o
C
Pin Table
Pin Parameter I/O Description
Power and Ground Pins
63/64 60 59 32 VDDLNA1-2 VDD_DMX VDD_IF VDD_IFVCOIN Power supply to LNA Power supply to downconverters Power supply to RX differential-to-single buffers Power supply to IF VCO first stage
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BT1074BI
Pin
21 6 19/20 31 40 41 47 50 3 61/62 56 34 22/23 13/15/18 7/9/11 26/27 5
R
850-950MHz RF TRANSCEIVER
Parameter I/O
-
Description
Power supply to TX upconverters Power supply to guard ring Power supply to pre-amplifier Power supply to transmitter Power supply to IF VCO Power supply to RF VCO Power supply to RF VCO input stage Power supply to receiver IF buffer Ground to LNA Ground to downconverters Ground to RX differential-to-single buffers Ground to IF VCO first stage Ground to TX upconverters Ground to pre-amplifier Ground to power amplifier Ground to transmitter Ground to RX LNA differential first stage Ground to RX LNA differential first stage Ground to IF VCO buffer Ground to IF VCO Ground to RF VCO Ground to RF VCO input stage Ground to receiver IF buffer Ground to IF VCO buffer
VDD_UPC VDDPA_GR VDD_PRE1-2 VDD_TXIF VDDIF_VCO VDDRF_VCO VDDRFVCOIN VDDRX_BUF GNDLNA GND_DMX1-2 GND_IF GND_IFVCOIN GND_UPC1-2 GND_PRE1-3 GND_PA1-3 GND_TXIF1-2 GNDLNA1P GNDLNA1N GNDIFBUF GNDIF_VCO GNDRF_VCO GNDRFVCOIN GNDRX_BUF IF_VCO_GND
RFICs for 850 - 2400MHz
1 37 39 42 44 53 33
TRFIC
Local Oscillator Pins
38 36 35 43 45 46 IF_VCO_OUT IFCAPIN IF_VCO_CTRL RF_VCO_OUT RF_VCO_CTRL RFVCOCAPIN O I I O I I IF VCO output IF VCO feedback capacitors input IF VCO control input RF VCO output RF VCO control input RF VCO resistor bias input
Transmitter Pins
8 10 24 12 14 RF_OUTN RF_OUTP TX_P_CNT REXT2 REXT1 O O I I I Power amplifier output Power amplifier output Transmission output power control: Hi - low power mode Low - high power mode Bias for power amplifier Bias for power amplifier
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850-950MHz RF TRANSCEIVER
BT1074BI
I/O
O O I I I
Pin
16 17 28 29 30
Parameter
LEXTN LEXTP TXI M_REF TXQ
Description
Output to external inductors Output to external inductors Baseband quadrature input to the transmitter I/Q input DC reference Baseband in-phase input to the transmitter
Receiver Pins
4 2 55 54 51 52 58 57 RF_INP RF_INN VCO2_IN MIXERINP MIXOUTN MIXOUTP RMX_OUTP RMX_OUTN I I I I O O O O RF Differential Input to the receiver RF Differential Input to the receiver Second Mixer's input RF input to the second mixer Differential output of second downconverter mixer Differential output of second downconverter mixer Differential output of downconverter mixer Differential output of downconverter mixer
TRFIC
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RFICs for 850 - 2400MHz
Power Down Pins
25 49 48 TX_EN RX_EN RF_VCO_EN I I I Transmitter power down control Receiver power down control RF VCO power down control
Detailed Pin Description:
RECEIVER
RF_INP and RF_INN (Pin 4 and Pin 2) RF Differential Inputs RF_INP and RF_INN are the differential inputs of the LNA. An AC coupling capacitor of 100pF is required. RF differential inputs are generated by an external phase-splitter circuit, but for a single RF input, the LNA can be biased, as shown in the Application Circuit. For optimum performance, the component lead length of the external phase-splitter circuit and PCB traces to the LNA input pins should be minimized. Also, the ground plane must surround the phase -splitter circuit to prevent noise coupling from other circuits. The frequency range is from 890MHz to 940MHz. RMX_OUTP and RMX_OUTN (Pin 58 and Pin 57) First IF Differential Outputs These are the differential outputs of the internal IF buffers. With the external IF combiner circuit as shown in the Application Circuit, the differential outputs become a single-ended output to drive a 110.592MHz Bandpass SAW filter. These internal IF buffers have open-drain outputs to drive an input impedance of a 300 BPF through the external combiner circuit. MIXERINP (Pin 54) Second IF Amplifier Input The output of a 110.592MHz BPF SAW filter is connected to this pin for the second stage downconversion. No AC coupling is required.
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BT1074BI
850-950MHz RF TRANSCEIVER
MIXOUTP and MIXOUTN (Pin 52 and Pin 51) Second IF Differential Outputs These are the second IF Amp differential outputs. The gain of the IF Amp can be controlled by connecting MIXOUTP through a resistor to ground. A 470 resistor to ground gives a 0dB gain. The other Amp output, MIXOUTN, is fed to a 10.7MHz BPF through an AC coupling (0.1uF) capacitor. VCO2_IN (Pin 55) External Clock Input A clock of 99.892MHz is fed to this pin to downconvert the first IF at 110.592MHz to 10.7MHz. No AC coupling is required. VDDLNA1, VDDLNA2 (Pin 63 and Pin 64) LNA power VDDLNA supplies power to the first and second stage of the LNA. Since the LNA input signal level is small and high frequency, the VDDLNA should be decoupled very close to the chip (for example, within 0.25 inches of the package). GNDLNA1P, GNDLNA1N and GNDLNA (Pin 5, Pin 1 and Pin 3) LNA Ground GNDLNA1P and GNDLNA1N pins are the ground for the first stage of the LNA and GNDLNA is the ground for the second stage of the LNA. GNDLNA1P and GNDLNA1N are internally separated. For stability and optimum performance, the GNDLNA1P and GNDLNA1N should be physically short. VDD_DMX (Pin 60) Downconverter Power VDD_DMX supplies power to the downconversion mixers. GND_DMX1, GND_DMX2 (Pin 61 and Pin 62) Downconverter Ground GND_DMX is the ground for the downconversion mixers. This ground connection is recommended to be shorted via holes to the ground plane below. VDD_IF and VDDRX_BUF (Pin 59 and Pin 50) IF Buffers and Second Downconversion Mixers Power Both power supplies require 0.1uF bypass capacitors to ground. GND_IF and GNDRX_BUF (Pin 56 and Pin 53) IF Buffers and Second Down-Conversion Mixers Ground GND_IF is the ground for the internal IF buffers, and GNDRX_BUF is the ground for the second downconversion mixers and IF amplifiers.
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RFICs for 850 - 2400MHz
TRANSMITTER
RF_OUTN and RF_OUTP (Pin 8 and Pin 10) Power Amplifier Outputs These are the differential outputs of the power amplifier which requires a combining network as shown in the Application Circuit. The combiner converts the differential signals to a single-ended signal and provides a matching impedance to 50 as well. DC bias to VDD is required since these are open-collector outputs, and AC coupling is needed after the combiner as shown.
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850-950MHz RF TRANSCEIVER
BT1074BI
LEXTN and LEXTP (Pin 16 and Pin 17) Preamplifier Amplifier Outputs These are the differential outputs of the preamplifier, which are open-collector types. Two inductors to the VDD are required for tuning the preamplifier to the desired frequency band. Recommended values for 900MHz are shown in the Application Circuit. Since these are also inputs to the power amplifier, the inductors should be close to the pins and isolated from the power amplifier output to avoid output feedback to these two pins, which may cause instability for the power amplifier. REXT1 and REXT2 (Pin 14 and Pin 12) Preamplifier/Power Amplifier Bias/Gain Adjust Rext1 is the biasing resistor for the preamplifier, and REXT2 is the biasing resistor for the power amplifier. For an output power of +15dBm, recommended values are 1k for REXT1 and 2.8k for REXT2. Increasing REXT1 and lowering REXT2 will lower output power, and vice versa. TXI, M_REF and TXQ (Pin 28, Pin 29 and Pin 30) Baseband Data Inputs These are the inputs which interface with the data signals from the digital signal processor (DSP) or microprocessor (P). TXI and TXQ are inphase (I) and quadrature (Q) signals, respectively. M_REF is the DC signal coming from the DSP/P. All of these pins require a DC level of VDD/2, and a voltage swing of 500mVp-p is required for TXI and TXQ. The Application Circuit shows a technique to interface with 1Vpp I and Q signals with a 6dB voltage attenuator with DC reference to M_REF pin. A low pass filter may also be required to reject sampling noise from the DSP/P. For DSS applications, the base band data input signal can be modulated at the IFVCO tank circuit using a Gaussian filter, prior to the PLL frequency synthesizer. For that, the M_REF pin has to be biased to half of +VDD supply and both the TXQ & TXI input have to connect to the M_REF pin through a resistor in order to adjust the TX output gain. VDDPA_GR (Pin 6) Power Supply for Guard Ring of Power Amplifier This power supply pin is only for the output stage of power amplifier. It should be decoupled right at the pin before sharing with other power supplies. VDD_PRE1, VDD_PRE2 (Pin 19 and Pin 20) Power Supply for Preamplifier These are the power supply pins dedicated to the preamplifier. Decoupling should be done right at these pins to a ground plane, if possible. VDD_UPC (Pin 21) Power Supply for RF Upconversion Mixers This is a dedicated power supply pin for the RF upconversion mixers. Decoupling should be done right at this pin to a ground plane, if possible. VDD_TXIF (Pin 31) Power Supply for Input Buffers and IF Upconversion Mixers The input buffers and IF upconversion mixers share this power supply on-chip. Besides the usual high frequency decoupling, it should be decoupled for low frequency, up to 10MHz.
TRFIC
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RFICs for 850 - 2400MHz
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BT1074BI
850-950MHz RF TRANSCEIVER
These are the dedicated ground pins that can share the same ground as long as a good ground plane is available: GND_PA1, GND_PA2, GND_PA3 (Pin 7, Pin 9 and Pin 11) Ground Pins for the Power Amplifier GND_PRE1, GND_PRE2, GND_PRE3 (Pin 13, Pin 15 and Pin 18) Ground Pins for the Preamplifier
RFICs for 850 - 2400MHz
GND_UPC1, GND_UPC2 (Pin 22 and Pin 23) Ground Pins for the RF Upconversion Mixers GND_TXIF1, GND_TXIF2 (Pin 26 and Pin 27) Ground Pin for the Input Buffers and IF Upconversion Mixers
RFVCO
RF_VCO_CTRL (Pin 45) RFVCO Input Control An external tank circuit is connected to the RFVCO Input Control pin (see Application Circuit). The tank circuit generates the overall oscillation frequency for the RFVCO and therefore must be optimized to avoid any interference from other components. The RF_VCO_CTRL pin and the external PLL completes the RF-PLL loop that generates a fixed oscillation frequency for the RFVCO. RF_VCO_OUT (Pin 43) RF_VCO Output The RF_VCO_OUT pin is connected to the external PLL to complete the RF-PLL loop. The PLL applies a DC voltage to the input tank circuit based on the detected RF_VCO_OUT signal. This DC voltage produces the negative bias voltage required by the Varactor to generate the necessary capacitance for the tank circuit network. VDDRFVCOIN and GNDRFVCOIN (Pin 47 and Pins 44) RFVCO Input Stage Power Supply and Ground VDDRFVCOIN is the power supply for the input stage of the RFVCO. For optimum performance, VDDRFVCOIN should be bypassed to GNDRFVCOIN using a low-inductance / high frequency coupling capacitor. The input stage of the RFVCO is very critical in generating the overall frequency of the RFVCO; therefore isolating these power supply pins will enhance the overall performance of the RFVCO. VDDRF_VCO and GNDRF_VCO (Pin 41 and Pin 42) RFVCO Power Supply and Ground VDDRF_VCO and GNDRF_VCO provide the power supply source for the other stages of the RFVCO. RFVCOCAPIN (Pin 46) RFVCO Resistor Bias Input This pin provides an off-chip resistor bias to the RF VCO.
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850-950MHz RF TRANSCEIVER IF VCO
BT1074BI
IF_VCO_CTRL (Pin 35) IF VCO Input This pin is connected to the external tank circuit as the VCO input. Its frequency is tuned to 221.184MHz (according to the RF module application) and can vary up to 500MHz. IFCAPIN (Pin 36) VCO Feedback Capacitors Input This pin provides an off-chip capacitive feedback loop to the VCO oscillator. IF_VCO_OUT (Pin 38) IF VCO Differential Outputs The VCO's oscillation frequency can be controlled by connecting its output to a PLL as shown in the Application Circuit. VDD_IFVCOIN (Pin 32) VCO Input Power Supply The IF VCO has two power supplies, VDD_IFVCOIN (Pin 32) and VDDIF_VCO (Pin 40). VDD_IFVCOIN is the first stage VCO power. A large capacitor of at least 100pF is recommended to connect this pin and ground for filtering out noise. VDDIF_VCO (Pin 40) VCO Buffer Power Supply This pin provides power to the internal VCO buffer circuitry. GND_IFVCOIN (Pin 34) VCO Input Ground This pin is the first stage VCO ground. GNDIFBUF (Pin 37) VCO Buffer Ground This pin is ground for the internal VCO buffer circuitry. IF_VCO_GND (Pin 33) Ground to IF VCO Buffer This pin is ground for the IF VCO buffer, which is used by the transmitter section during transmission. GNDIF_VCO (Pin 39) VCO Ground This pin is ground for the internal VCO circuitry.
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RFICs for 850 - 2400MHz
POWER SAVING/POWER DOWN PINS
The following pins are all CMOS digital interface. TX_P_CNT (Pin 24) Transmission Output Power Control This pin controls the power amplifier output with two levels. A HIGH signal puts the power amplifier in low power mode with -4dBm output power. A LOW signal puts the power amplifier in high power mode with +17dBm output power. These power levels are based upon the resistor values shown for REXT1 & REXT2.
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BT1074BI
850-950MHz RF TRANSCEIVER
TX_EN (Pin 25) Transmitter Power Down Control This pin controls the power down function of the entire transmitter, including the power amplifier and preamplifier. A HIGH signal turns the circuit on while a LOW signal turns the circuit off. RF_VCO_EN (Pin 48) RF VCO Power Down Control This pin controls the power-down function of the RF VCO, which is used by the transmitter and the receiver. A HIGH signal turns the circuit off while a LOW signal turns the circuit on. RX_EN (Pin 49) Receiver Power Down Control This pin controls the power down function of the entire receiver. A HIGH signal turns the circuit off while a LOW signal turns the circuit on.
RFICs for 850 - 2400MHz
TYPICAL PERFORMANCE CHARACTERISTICS
The recommended TDD mode as well as power saving mode usage of all of these control pins are as follows:
R
TRFIC
Communication Mode Pins TX_EN RX_EN RF_VCO_EN TX_P_CNT TX HI HI LO LO RX LO LO LO LO
Power Save Mode* LO HI HI HI
Note: Control level for minimum power consumption.
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850-950MHz RF TRANSCEIVER
BT1074BI
Block Diagram
Tx/Rx: 902-928MHz*
IF1=110.592MHz 3dB BW=1.1MHz
BT1074BI
TRFIC
(99.892MHz)
RF_INN RF INP LPF & ANT. SW
LNA
Image-Reject Mixer IF Mixer I FAmp (adjustable)
LC or RC Filter Fc=10.7MHz Zin=Zout=330
R
RFICs for 850 - 2400MHz
RF VCO
RFVCO_OUT
(791.408 ~ 817.408MHz)
IF VCO
IFVCO_OUT (221.184MHz)
RFVCO_CTRL
IFVCO_CTRL (442.368MHz)
RF_OUTN RF OUTP
Power Amp (Pout=15dBm)
IF Filter
I/Q INPUT
RF Filter RF Mixer (110.592MHz)
Buffer
*: ISM Band
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BT1074BI
RECEIVER:
(Noise Figure Vs. Freq) 6.2 Wave D0:A0:par(nf) D0:A1:par(nf) D0:A2:par(nf) 5.8
D0:A2:par(nf)
850-950MHz RF TRANSCEIVER
(Noise Figure Vs. Freq) Wave Symbol 3.85
Symbol 6
D0:A0:par(nf) D0:A1:par(nf)
3.8
5.6 5.4 5.2 5 4.8 4.6
3.6 3.65 3.75
3.0V
120C
3.7
4.4 4.2 4
Params (lin)
3.55
3.3V
RFICs for 850 - 2400MHz
Params (lin)
3.8 3.6 3.4
25C -40C
3.5
3.45
3.4
3.2 3 2.8
3.3
3.35
2.6 2.4 2.2
3.2
2.7V
3.25
2 1.8 1.6
3.1
3.15
1.4
800x Frequency (lin) (HERTZ)
1g
800x Frequency (lin) (HERTZ)
1g
Figure 1. NF vs. Freq, varying temp.
Figure 2. NF vs. Freq, varying Vdd
1dB Compression of RF Front-end of bt1074b, post layout simulation, Typical (1db.sp, rx_rf_top.lnt, vco810_top_y.lnt)
RF Front-End IIP3, Post Layout (Typical)
IIP 3=-1 2dB m P ow er G ain=1 9dB 40.000
Wave D0:A0:v(ifout)
Symbol 3.7
3.6
-22 dBm
3.5
R
3.4
3.3
TRFIC
3.2
20.000
3.1
Voltages (lin)
0.000 -20.000 -40.000
-12 dBm
3
2.9
2.8
-60.000
2.7
-80.000
2.6
-1 00.000
2.5
-1 20.000 -50.000 -40.000 -30.000 -20.000 -1 0.000 0.000
2.4
2.3
P in (d B m )
0 50n 100n 150n 200n 250n 300n 350n 400n 450n Time (lin) (TIME) 500n 550n 600n 650n 700n 750n 800n
Figure 3. IP3 (LNA + RF Mixer)
Figure 4. P1dB (LNA + RF Mixer)
IP3(POSTLAYOUT SIM)with Gain Control R=30 (15 dB Gain) 20 25C,3.0V, TYP IP3 = -9.2183 dBm
One DB Compression 0
One dB Compression -5
= -20 dBm
0
25C,3.0V, TYP, 15 dB Gain
-20
-9.2 dBm
Output Power (dBm)
-10
-20 dBm
Output Power (dBm)
-15
-40
-60
1st harmonic simulation point 3rd harmonic simulation point
-20
-25
-80
-100 -40
-30 -40
-35
-30
-35
-30
-25 -20 Input Power (dBm)
-15
-10
-5
-25 Input Power (dBm)
-20
-15
-10
Figure 5. IP3 (IF Mixer + IF Amp)
Figure 6. P1dB (IF Mixer + IF Amp)
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850-950MHz RF TRANSCEIVER
TRANSMITTER: RFVCO:
2.7V
BT1074BI
-40C
3.0V 25C
TBD
120C
TBD
3.3V
TRFIC
R
RFICs for 850 - 2400MHz
Figure 7. Freq vs. Cap., varying temp. IFVCO:
-40C
Figure 8. Freq vs. Cap., varying vdd
2.7V 25C
3.0V
120C
TBD
TBD
3.3V
Figure 9. Freq vs. Cap., varying temp.
Figure 10. Freq vs. Cap., varying vdd
APPLICATION INFORMATION:
The BT1074BI is a complete RF transceiver which integrates the receiver, transmitter and local oscillator functions into one chip. Designed to operate in TDD mode, the chip supports ISM band applications, including DSS. The example described here (and shown in the Application Circuit) shows the BT1074BI used in a 902-928MHz product. Only the RF VCO, IF VCO and power combiner impedance component matching values need to be changed to use the BT1074BI for other frequency bands (i.e. 868-870MHz).
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BT1074BI
902-928MHz Example
850-950MHz RF TRANSCEIVER
RFICs for 850 - 2400MHz
The transmitter accepts I&Q inputs from the system interface which also provides the DC reference level to M_REF pin. An on-chip RF filter removes spurious signals before going to the on-chip power amplifier. RF outputs are differential and a power combining network is required for converting to a single-ended interface with an output load (see Application Circuit on page 15). A power control pin selects between high or low transmission power mode, which ranges from -4dBm to +17dBm. The power level can also be set with resistors at REXT2 and REXT1 pins. In the receiver section, an on-chip bandpass filter is provided between the LNA output and downconverter mixer input for optimum noise performance. The first IF outputs at 110.592MHz are differential and require a power combiner. The second IF mixer downconverts the first IF signal from 110.592MHz to 10.7MHz by an external crystal clock input at 99.892MHz. A gain-adjustable IF amplifier provides additional gain up to 20dB. The RF local oscillator and the transmitter IF oscillator are conveniently provided on-chip and can be used with an external dual PLL frequency synthesizer. Both the RF and IF local oscillators require external tuning elements, as shown in the Application Circuit on page 15. The receiver, transmitter, and the two oscillators can each be put into sleep mode with on-chip power-down control pins. These functions can be turned on or off by a microcontroller. For example, in the receiving mode, the microcontroller will turn on the receiver and will turn off the transmit function. The RF and IF VCOs will always be on during the TX and RX mode. In the transmitting mode, the microcontroller will turn on the transmitter and will turn off the receiver function. The recommended usage of the BT1074BI is shown in the digital spread spectrum system block diagram on the next page in Figure A:
TRFIC
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850-950MHz RF TRANSCEIVER
BT1074BI
Digital Spread Spectrum System Block Diagram
TRFIC
Antenna
BPF
Digital Spread Spectrum Controller
R
MIXOUTP/MIXOUTN RF_INP/RF_INN
50
Demodulator
RFICs for 850 - 2400MHz
BTI
RF_OUTP/RF_OUTN
RF_VCO_OUT RF_VCO_CTRL
BT1074BI
Dual-Synthesizer
IF_VCO_OUT IF_VCO_CTRL
IFVCO Tank
Modulated Signal
Figure A
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BT1074BI
850-950MHz RF TRANSCEIVER
APPLICATION CIRCUIT: I & Q INPUT MODULATION
B4542 fc =110.592MHz IL<12.2dB 3dB BW = 1.1MHz
VddRX 22pF 0.1uF
220nH
RFICs for 850 - 2400MHz
100pF
270nH
3.3pF
Antenna
VddRX
3.3pF
330nH 99.892 MHz 100pF VddRX 0.1uF 0.1uF 10.7MHz
FM DEMODULATOR
RX_DATA OUT
50
100pF
VddRX
53 GNDRX_BUF
62 GND_DMX2
57 RMX_OUTN
61 GND_DMX1
58 RMX_OUTP
VDDRX_BUF
60 VDD_DMX
64 VDDLNA2
63 VDDLNA1
MIXERINP
100pF
55 VCO2_IN
56 GND_IF
52 MIXOUTP
51 MIXOUTN
59 VDD_IF
100pF
49 RX_EN
Rx Power Down
54
50
GNDLNA1N 100pF RF_INN GNDLNA RF_INP VddTX VddTX GNDLNA1P VDDPA_GR 8.2nH 1nF 12nH RF_OUTN GND_PA2 2.2pF VddTX 5.6nH REXT2 10K GND_PRE1 REXT1 3.3pF RF_OUTP GND_PA3 100pF GND_PA1
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
21 M_REF 29 VDD_TXIF 31
48
RF_VCO_EN
47 VDDRFVCOIN 46 RFVCOCAPIN 45 RF_VCO_CTRL 44 GNDRFVCOIN
RF VCO Power Down VddRFVCO 470 100pF 18K 15pF 2.7nH 220pF 27nF VddRFVCO BBY51-03W RF VCO In 100pF VddIFVCO 100pF External VDD 100pF 3.3K RF PLL Control 1.8K 4.7nF
BTI
42 GNDRF_VCO 41 VDDRF_VCO 40 VDDIF_VCO 39 GNDIF_VCO 38 IF_VCO_OUT 37 GNDIFBUF 36 35 34 33 VDD_IFVCOIN 32 30 TXQ GND_TXIF2 27 IFCAPIN
15pF
TRFIC
BT1074BI
220
IF_VCO_CTRL GND_IFVCOIN IF_VCO_GND
15pF 12pF 18K 5.6K
IF VCO In
ANTENNA SWITCH
560
GND_PRE2 LEXTN 6.8nH
18
23
TX_EN 25
TXI 28
17
20
22
19
24
26
16
IF PLL Control 39nH BBY51-03W 220pF 33nF 3.3K 2.7nF
GND_PRE3
VDD_UPC
GND_UPC1
GND_UPC2
LEXTP
VDD_PRE1
VDD_PRE2
TX_P_CNT
VddTX 6.8nH 100pF
GND_TXIF1
VddTX 100pF
VddIFVCO 100pF VddTX
High / Low PA Power Mode
Tx Power Mode
100pF
1.5k 1K
1.5k 1K
1uF
I
MREF Q
INPUT
Figure C
May 29, 2001
Confidential and Proprietary Information of BTI
Page 16
Dual PLL
43 RF_VCO_OUT
R
850-950MHz RF TRANSCEIVER
BT1074BI
APPLICATION CIRCUIT: DIRECT INPUT MODULATION AT IFVCO
B4542 fc =110.592MHz IL<12.2dB 3dB BW = 1.1MHz
VddRX 22pF 0.1uF
220nH
100pF
270nH
3.3pF
TRFIC
Antenna
VddRX
3.3pF
330nH 99.892 MHz 100pF VddRX 0.1uF 0.1uF 10.7MHz
FM DEMODULATOR
RX_DATA OUT
50
100pF
VddRX
R
53 GNDRX_BUF
62 GND_DMX2
57 RMX_OUTN
61 GND_DMX1
58 RMX_OUTP
VDDRX_BUF
60 VDD_DMX
64 VDDLNA2
63 VDDLNA1
MIXERINP
100pF
55 VCO2_IN
56 GND_IF
52 MIXOUTP
51 MIXOUTN
59 VDD_IF
100pF
49 RX_EN
Rx Power Down
RFICs for 850 - 2400MHz
54
50
GNDLNA1N 100pF RF_INN GNDLNA RF_INP VddTX VddTX GNDLNA1P VDDPA_GR 8.2nH 1nF 12nH 2.2pF VddTX 5.6nH REXT2 10K GND_PRE1 REXT1 3.3pF RF_OUTP GND_PA3 RF_OUTN GND_PA2 100pF GND_PA1
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
21 M_REF 29 VDD_TXIF 31
48
RF_VCO_EN
47 VDDRFVCOIN 46 RFVCOCAPIN 45 RF_VCO_CTRL 44 GNDRFVCOIN
RF VCO Power Down VddRFVCO 470 100pF 18K 15pF 2.7nH 220pF 27nF VddRFVCO BBY51-03W RF VCO In 100pF VddIFVCO 100pF External VDD 100pF 3.3K RF PLL Control 1.8K 4.7nF
BTI
42 GNDRF_VCO 41 VDDRF_VCO 40 VDDIF_VCO 39 GNDIF_VCO 38 IF_VCO_OUT 37 GNDIFBUF 36 35 34 33 VDD_IFVCOIN 32 30 TXQ GND_TXIF2 27 IFCAPIN
15pF
BT1074BI
220
IF_VCO_CTRL GND_IFVCOIN IF_VCO_GND
15pF 12pF 18K 5.6K
IF VCO In
ANTENNA SWITCH
560
GND_PRE2 LEXTN 6.8nH
18
23
TX_EN 25
17
TXI 28
20
22
19
24
26
16
IF PLL Control 39nH BBY51-03W 220pF 33nF 3.3K 2.7nF
GND_PRE3
VDD_UPC
GND_UPC1
GND_UPC2
LEXTP
VDD_PRE1
VDD_PRE2
TX_P_CNT
VddTX 6.8nH 100pF
GND_TXIF1
VddTX 100pF
VddIFVCO 100pF VddTX
LPF
High / Low PA Power Mode
Tx Power Mode
100pF
56K
56K
TX MOD_IN
6.8K VddTX 100pF
10K
Figure B
May 29, 2001
Confidential and Proprietary Information of BTI
Page 17
Dual PLL
43 RF_VCO_OUT
BT1074BI
Package Dimensions
He E A2 A1 Y
850-950MHz RF TRANSCEIVER
10x10x1.0 64 LD TQFP PACKAGE:
Symbol A1 A2 b c D E e Hd He L L1 Y Min. Millimeter Nom. 0.10 1.00 0.2 0.127 10.00 10.00 0.50 12.00 12.00 0.60 1.00 Max. Min. Inch Nom. .004 .039 .008 .005 0.394 0.394 0.020 0.472 0.472 0.024 0.039 Max.
RFICs for 850 - 2400MHz
Hd D
9.90 9.90 11.90 11.90 0.45
10.10 10.10 12.10 12.10 0.75 0.08 7
0.390 0.390 0.468 0.468 0.018
0.398 0.398 0.476 0.476 0.030 0.003 7
L1 b L e c
0
0
TRFIC
R
The information provided herein is believed to be accurate and correct. BethelTronix, Inc. assumes no responsibility for the inaccuracies or use of the information or the use of the described product. BethelTronix, Inc. reserves the right to make changes in circuit design and/ or specifications at any time without further notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third parties.
Copyright 2001 BethelTronix, Inc. All rights reserved
May 29, 2001
Confidential and Proprietary Information of BTI
Page 18

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