Texas Instruments TRF1400DW Datasheet

D

Wide VHF/UHF Frequency Range

200 MHz to 450 MHz for World-Wide

Remote Control Frequency Compatibility

D

High Receiver Sensitivity ... –103 dBm at
315 MHz

D

Accepts Baseband Data Rates From 500 Hz
to 10 kHz

D

Manchester-Decoded and Raw Baseband
Outputs for Easy Interface to Serial Data
Decoders and Microcontrollers

D

TRF (Tuned Radio Frequency) Design
Eliminates Local Oscillator (No Emissions)
and Reduces Many Government Type
Approvals (Including FCC)

D

Adjustable Internal Sampling Clock Set By
External Components

description

TRF1400

RF TELEMETRY RECEIVERS

VHF/UHF RZ ASK REMOTE CONTROL RECEIVER

SLWS014E – JUNE 1996 – REVISED APRIL 1998

D

Internal Amplifier and Comparator for
Amplification and Shaping of Low-Level
Input Signals With Average-Detecting
Autobias Adaptive Threshold Circuitry for
Improved Sensitivity

D

Minimum External Component Count and
Surface-Mount Packaging for Extremely
Small Circuit Footprint – Typically Replaces
More Than 40 Components in an Equivalent
Discrete Solution

D

No Manual Alignment When Using SAW
Filters

D

Advanced Submicron BiCMOS Process
Technology for Minimum Power
Consumption

The TRF1400 VHF/UHF RZ ASK remote control
receiver is specifically designed for RZ ASK
(return-to-zero amplitude-shift keyed) commu­nications systems operating in the 200-MHz to
450-MHz band. This device is targeted for use in
automotive and home security systems, garage
door openers, remote utility metering, and other
low-power remote control and telemetry systems.

A complete RZ ASK receiver solution on a chip,
the TRF1400 requires only a minimum of external
components for operation. This significantly
reduces the complexity and footprint of new
designs compared with current discrete receiver
designs. The TRF1400 requires no manual

LPF
AGND
RFIN3

A VCC

AGND

A VCC

AGND

OFFSET

AGND
OSCR
OSCC
DVCC

DW PACKAGE

(TOP VIEW)

1
2
3
4
5
6
7
8
9
10
11
12

24
23
22
21
20
19
18
17
16
15
14
13

RFOUT2
LNA2T
RFIN2
AGND
RFOUT1
LNA1T
RFIN1
AGND
DOUT
TRIG
BBOUT
DGND

alignment when using external SAW (surface
acoustic wave) filters. For a lower-cost solution,
the device is also compatible with external LC
components.

The TRF1400 also includes several on-chip features that normally require additional circuitry in a receiver
system design. These include two low-noise front-end amplifiers, an RF amplifier/comparator for detection and
shaping of input signals, and a demodulated RZ ASK baseband TTL-level output that readily interfaces to
self-synchronizing devices. Also included is on-chip Manchester decoding logic that provides a specially
formatted TTL data output, synchronized with a trigger output, for easy interface to any microcontroller using
Manchester-encoded data.

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

Copyright  1998, Texas Instruments Incorporated

1

TRF1400
RF TELEMETRY RECEIVERS
VHF/UHF RZ ASK REMOTE CONTROL RECEIVER

SLWS014E – JUNE 1996 – REVISED APRIL 1998

description (continued)

The TRF1400 VHF/UHF RZ ASK remote control receiver is available in a 24-pin SOIC (DW) package, and is
characterized for operation over the temperature range of –40°C to 85°C. The DW package is available taped
and reeled; add R suffix to device type when ordering (e.g., TRF1400DWR).

functional block diagram

LPF

AGND

RFIN3

AVCC

AGND

AVCC

AGND

OFFSET

AGND

OSCR

1

2

3

4

Six Log-Detecting

5

RF Amp Stages

6

7

8

9

10

Summing
Amp

Auto Level

Comparator

+–

LNA2

LNA1

Manchester

Decoding

Logic

24

23

22

21

20

19

18

17

16

15

RFOUT2

LNA2T

RFIN2

AGND

RFOUT1

LNA1T

RFIN1

AGND

DOUT

TRIG

Clock

OSCC

DVCC

2

11

12

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SCLK

14

13

BBOUT

DGND

I/O

DESCRIPTION

TRF1400

RF TELEMETRY RECEIVERS

VHF/UHF RZ ASK REMOTE CONTROL RECEIVER

SLWS014E – JUNE 1996 – REVISED APRIL 1998

Terminal Functions

TERMINAL

NAME NO.

AGND 2, 5,

7, 9,

17, 21
AVCC 4, 6 Positive power supply voltage for all analog circuits — 4.5 V to 5.5 V
BBOUT 14 O Baseband data output. BBOUT is the demodulated envelope of the recovered RF signal and is active with any

DGND 13 Digital ground for all internal logic circuits. DGND is not internally connected to analog ground (AGND).
DOUT 16 O Data output. Data appearing at DOUT is a binary, TTL representation of the baseband data, and is only meaningful

DVCC 12 Positive power supply voltage for all digital circuits. DVCC is 4.5 V to 5.5 V . For best noise performance, DVCC

LNA1T 19 Low-noise amplifier (LNA) 1 ground termination. LNA1T should be connected to AGND through a parallel

LNA2T 23 Low-noise amplifier (LNA) 2 ground termination. LNA2T should be connected to AGND through a parallel

LPF 1 Connection for external low-pass capacitor used in the average-detecting adaptive threshold circuitry.
OFFSET 8 Connection for external offset resistor. A resistor (1 MΩ suggested) sets the internal threshold detector offset

OSCC 11 Internal oscillator frequency-setting capacitor. A capacitor , connected between OSCC and ground, in conjunction

OSCR 10 Internal oscillator frequency-setting resistor. A resistor , connected between OSCR and OSCC, in conjunction with

RFIN1 18 I RF input to first low-noise, high-gain amplifier stage
RFIN2 22 I RF input to second low-noise, high-gain amplifier stage
RFIN3 3 I RF input to the detecting RF amplifier stages. Filtered RF in the form of AM RZ ASK data at frequencies between

RFOUT1 20 O RF output of the first low-noise, high-gain amplifier
RFOUT2 24 O RF output of the second low-noise, high-gain amplifier. Typically, the input of an external SAW or LC filter is

TRIG 15 O Trigger output. TRIG pulses to indicate each new received data cell and is only meaningful when

Analog ground for all internal analog circuits. AGND is not internally connected to digital ground (DGND). All
analog signals are referenced to AGND.

received ASK signal coding format.

when Manchester-encoded ASK data is received. DOUT is active high and is internally pulled down.

should connect to AVCC at the power supply, not at the TRF1400 device.

resistor-capacitor bias network. If left unconnected, LNA1 is disabled.

resistor-capacitor bias network. If left unconnected, LNA2 is disabled.

voltage. Lowering the value of this resistor decreases device sensitivity .

with a resistor connected between OSCR and OSCC, determines the speed of the internal clock oscillator (SCLK).
The SCLK signal is used for processing the demodulated incoming data stream and controls the Manchester
decoding and timing recovery logic sections of the device. The internal oscillator must be set to 10 times the
received Manchester data rate for valid TRIG and DOUT, or to 5 times the received baseband data rate.

a capacitor connected between OSCC and ground determines the speed of the internal oscillator (SCLK). The
SCLK signal is used for processing the demodulated incoming data stream and controls the Manchester decoding
and timing recovery logic sections of the device. The internal oscillator must be set to 10 times the received
Manchester data rate for valid TRIG and DOUT, or to 5 times the received baseband data rate.

200 MHz and 450 MHz, at a baud rate between 500 Hz and 10 kHz can be applied to RFIN3 for detection and
decoding.

connected to RFOUT2.

Manchester-encoded ASK data is received. TRIG is active high and is internally pulled down.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

3

TRF1400

DOUT, TRIG, BBOUT

RF TELEMETRY RECEIVERS
VHF/UHF RZ ASK REMOTE CONTROL RECEIVER

SLWS014E – JUNE 1996 – REVISED APRIL 1998

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

†

Supply voltage range, AVCC, DVCC (see Note 1) –0.6 to 6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage range, V

–0.6 to 6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I

Continuous total power dissipation 180 mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range, T
Storage temperature range, T

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

stg

–55°C to 85°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A

ESD protection, all terminals: human body model 2 kV. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

machine model 200 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

JEDEC latchup 150 mA or 11 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

†

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: Voltage values are with respect to GND.

recommended operating conditions

MIN NOM MAX UNIT

Supply voltage, V
Input frequency, f
Operating free-air temperature, T

Minimum permissible AM modulation of RF envelope applied to RF Input, measured at –101 dBm 25%

CC

in

A

4.5 5.5 V

200 450 MHz

–40 85 °C

electrical characteristics as measured in the test circuit detailed in Figures 1 through 6 with

= 315 MHz over recommended ranges of supply voltage and operating free-air temperature,

f

in

typical values are at V

= 5 V and TA = 25°C (unless otherwise noted)

CC

current consumption

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

I

Average supply current from V

CC

CC

I/O pins terminated with typical loads,
Signal applied with a 5-kHz baseband data rate

I/O pins terminated with typical loads,
Signal applied with a 2.5-kHz Manchester data rate

I/O pins terminated with typical loads, no data input 2.5

2.7 3.5

2.7 3.5

mA

digital interface

PARAMETER TEST CONDITIONS MIN MAX UNIT

V

High-level output voltage

OH

V

Low-level output voltage

OL

IOH = 3.2 mA VCC–0.5 V
IOL = –3.2 mA 0.5 V

VSWR (voltage standing-wave ratio), ripple rejection

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

VSWR into 50 Ω at RFIN1, RFOUT1, RFIN2, RFOUT2,
RFIN3

Ripple rejection at BBOUT while maintaining
BER = 1/100 (see Note 2)

NOTE 2: BER (bit error rate = errors/number of bits) is qualified by integration of logic-level pulses (>50% high = 1, <50% low = 0). (See the

System Design Considerations Using the TRF1400 RF Telemetry Receivers Application Report, TI literature number SLWA005, for
more BER information.)

With external LC matching network 2:1 V/V
1 MHz injected at AVCC and DVCC,

Carrier level = –50 dBm

6% V

CC

4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

1/100 at 5 kHz b

in

,

103–101

dBm

TRF1400

RF TELEMETRY RECEIVERS

VHF/UHF RZ ASK REMOTE CONTROL RECEIVER

SLWS014E – JUNE 1996 – REVISED APRIL 1998

RF sensitivity/overload

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

RF input level (average) at test board RF input required for BER

aseband data rate,

2.5 kHz Manchester data rate (see Note 2)
Overload signal level at fc with BER 1/100 at 5 kHz baseband

data rate, 2.5 kHz Manchester data rate (see Note 2)

NOTES: 2. BER (bit error rate = errors/number of bits) is qualified by integration of logic-level pulses (>50% high = 1, <50% low = 0).

3. The SAW bandpass filter must have a rejection level greater than or equal to 50 dB at ±0.5 fc, an insertion loss of less than or equal
to 3 dB, and a –3 dB passband width of 0.2% fc, where fc is the passband center frequency of the SAW filter.

oscillator (internal clock)

PARAMETER MIN MAX UNIT

Sample clock frequency , SCLK (5 × baseband data rate, 10× Manchester data rate) 2.5 50 kHz
Frequency spread (process variation, temperature, VCC), not including external component tolerance ±5%

timing requirements over recommended ranges of supply voltage and operating free-air
temperature

VCC = 5 V, TA = 25°C,
f

= 315 MHz,
external SAW preselector bandpass
filter (see Note 3)

VCC = 5 V,
fin = 315 MHz

TA = 25°C,

–

–20 dBm

RF input data (see Figure 7)

MIN MAX UNIT

t

Rise time at RFIN1 0.1 t

r

t

Fall time at RFIN1 0.1 t

f

w3
w3

µs
µs

received data

MIN MAX UNIT

Baseband data frequency, AM RZ ASK 0.5 10 kHz
Manchester data frequency, AM RZ ASK 0.25 5 kHz
Pulse period tolerance for synchronization, valid TRIG and DOUT data ±8%
Pulse duty cycle for synchronization, valid TRIG and DOUT data 49% 51%

t

Dead time between wakeup time and frame start time (for synchronization valid, TRIG and

x

DOUT data) (see Figure 8)

t

Duration, modulated RF carrier (see Figure 9) 100 2000 µs

w3

38 ÷ SCLK 317 ÷ SCLK ms

switching characteristics over recommended ranges of supply voltage and operating free-air
temperature

device latency for BBOUT, TRIG, DOUT (see Figure 9)

PARAMETER MIN TYP MAX UNIT

Delay time between power applied and output signal at BBOUT 10 ms
Demodulation delay time across device (RF Input to BBOUT) 10 µs

t

Delay time between BBOUT ↑ and TRIG ↑ 2.5 ÷ SCLK µs

d1

t

Delay time between DOUT ↑ and TRIG ↑ 0.5 ÷ SCLK µs

d2

RF carrier (see Figure 9)

t

Duration, logic 0 data cell 2 t

w0

t

Duration, logic 1 data cell 2 t

w1

t

Duration, trigger pulse 0.5 ÷ SCLK µs

w2

PARAMETER MIN TYP MAX UNIT

w3
w3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

µs
µs

5

TRF1400
RF TELEMETRY RECEIVERS
VHF/UHF RZ ASK REMOTE CONTROL RECEIVER

SLWS014E – JUNE 1996 – REVISED APRIL 1998

PARAMETER MEASUREMENT INFORMATION

TRF1400 electrical characteristics are measured with the device connected in the circuit shown in Figure 1.
As with any RF design, the successful integration of the device into a circuit board relies heavily on the layout

of the board and the quality of the external components. Figures 2 through 6 show the layout of the circuit board
used to obtain the TRF1400 electrical characteristics. T able 1 lists the parts required to complete the test circuit,
which demonstrates TRF1400 performance at 315 MHz. Specified component tolerances (and Q where
applicable) should be observed during the selection of parts. Tables 2 through 4 give S parameters for each of
the RF signal processing blocks.

A complete set of Gerber photoplotter files for the circuit board can be obtained from any TI Field Sales Office.

L2

SAW
Filter

L3

C6

C2

R8

C20

C19

DOUT

AGND

DOUT

TRIG

R7

TRIG

OSCR

R4

R5

R11

LED

R6

C18

131415161718192021222324

BBOUT

OSCC

C15

RF Input

C9

C5

C7

RFOUT2

LPF

123456789101112

LNA2T

AGND

C10

RFIN2

RFIN3

C8

L4

C4

AGND

AVCC

RFOUT1

TRF1400 (U1)

AGND

C11 C12

AVCC

R1R2

LNA1T

C1

L1

C3

RFIN1

AGND

AGND

OFFSET

R3

Buzzer

BBOUT

DGND

DVCC

C16

+

Optional

C17

C13

C14

AVCC

R10

(Short)

R9

Optional

S1

E1 E2

H1 H2

(Jumpers)

Vcc1

B1X

DVCC

Figure 1. TRF1400 Test Circuit for 315-MHz Operation

6

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