ATA5756/ATA5757 - Complete

ATA5756/ATA5757
UHF ASK/FSK Transmitter
DATASHEET
Features
● PLL transmitter IC with single-ended output
● High output power (6dBm) at 8.1mA (315MHz) and 8.5mA (433MHz) typical values
● Divide by 24 (Atmel® ATA5756) and 32 (Atmel ATA5757) blocks for 13MHz crystal
frequencies and for Low XTO start-up times
● Modulation scheme ASK/FSK with internal FSK switch
● Up to 20kBaud manchester coding, up to 40kBaud NRZ coding
● Power-down idle and power-up modes to adjust corresponding current consumption
through ASK/FSK/enable input pins
● ENABLE input for parallel usage of controlling pins in a 3-wire bus system
● CLK output switches ON if the crystal current amplitude has reached 35% to 80% of its
●
●
●
●
final value
Crystal oscillator time until CLK output is activated, typically 0.6ms
Supply voltage 2.0V to 3.6V in operation temperature range of –40°C to +125°C
ESD protection at all pins (4kV HBM)
Small package TSSOP10
Benefits
● Low parasitic FSK switch integrated
● Very short and reproducible time to transmit typically < 0.85ms
● 13.125MHz/13.56MHz crystals give opportunity for small package sizes
4702M-RKE-09/15
1.
Description
The Atmel® ATA5756/ATA5757 is a PLL transmitter IC which has been developed for the demands of RF low-cost
transmission systems at data rates up to 20kBaud Manchester coding and 40kBaud NRZ coding. The transmitting frequency
range is 313MHz to 317MHz (Atmel ATA5756) and 432MHz to 448MHz (Atmel ATA5757), respectively. It can be used in
both FSK and ASK systems. Due to its shorten crystal oscillator settling time it is well suited for Tire Pressure Monitoring
(TPM) and for Passive Entry Go applications.
Figure 1-1. System Block Diagram
UHF ASK/FSK
TPM and Remote control
transmitter
UHF ASK/FSK
Remote control receiver
1 Li cell
U3741B/
U3745B/
T5743/
T5744
ATA5756/
ATA5757
Keys
Encoder
ATARx9x
Antenna
ATA5756/ATA5757 [DATASHEET]
Antenna
VCO
Power
amp.
4702M–RKE–09/15
Control
PLL
XTO
2
1 to 3
Demod
PLL
LNA
VCO
XTO
Microcontroller
2.
Pin Configuration
Figure 2-1. Pinning TSSOP10
Table 2-1.
Pin
CLK
1
10
ENABLE
ASK
2
9
GND
FSK
3
8
VS
ANT2
4
7
XTO1
ANT1
5
6
XTO2
ATA5756
ATA5757
Pin Description
Symbol
Function
Configuration
VS
1
2
CLK
ASK
Clock output signal for the
microcontroller.
The clock output frequency is set by
the crystal to fXTAL/8.
The CLK output stays Low in powerdown mode and after enabling of the
PLL.
The CLK output switches on if the
oscillation amplitude of the crystal
has reached a certain level.
Switches on the power amplifier for
ASK modulation and enables the
PLL and XTO if the ENABLE pin is
open
100Ω
CLK
100Ω
200kΩ
200kΩ
FSK
3
FSK
Switches off the FSK switch (switch
has high Z if signal at pin FSK is
High) and enables the PLL and the
XTO if the ENABLE pin is open
50kΩ
ASK
VRef = 1.1V
20µA
200kΩ
200kΩ
VRef = 1.1V
5µA
ATA5756/ATA5757 [DATASHEET]
4702M–RKE–09/15
3
Table 2-1.
Pin Description (Continued)
Pin
Symbol
4
ANT2
Function
Configuration
Emitter of antenna output stage
ANT1
5
ANT1
Open collector antenna output
ANT2
210µA
6
XTO2
Diode switch, used for FSK
modulation
(FSK < 0.25V)
and
(ENABLE > 1.7V)
XTO2
VS
1.5kΩ
7
XTO1
VS
1.2kΩ
Connection for crystal
XTO1
182µA
8
VS
9
GND
Supply voltage
See ESD protection circuitry (see Figure 4-9 on page 14)
Ground
See ESD protection circuitry (see Figure 4-9 on page 14)
VS
ENABLE input
30µA
10
ENABLE
If ENABLE is connected to GND and
the ASK or FSK pin is High, the
device stays in idle mode.
In normal operation ENABLE is left
open and ASK or FSK is used to
enable the device.
(FSK > 1.7V)
or
(ASK > 1.7V)
ENABLE
150kΩ
250kΩ
4
ATA5756/ATA5757 [DATASHEET]
4702M–RKE–09/15
Figure 2-2. Block Diagram
ATA5756/
ATA5757
Power up/down
CLK
1
EN
f
ENABLE
10
8
f
ASK
2
OR
24/
32
GND
9
PDF
VS
8
FSK
3
CP
Ampl. OK
ANT2
4
XTO
XTO1
7
LF
EN
ANT1
5
VCO
PA
XTO2
6
PLL
3.
General Description
This fully integrated PLL transmitter allows the design of simple, low-cost RF miniature transmitters for TPM and RKE
applications. The VCO is locked to 24  fXTAL/32  fXTAL for Atmel® ATA5756/ATA5757. Thus, a 13.125MHz/13.56MHz crystal
is needed for a 315MHz/433.92MHz transmitter. All other PLL and VCO peripheral elements are integrated.
The XTO is a series resonance (current mode) oscillator. Only one capacitor and a crystal connected in series to GND are
needed as external elements in an ASK system. The internal FSK switch, together with a second capacitor, can be used for
FSK modulation. The crystal oscillator needs typically 0.6 ms until the CLK output is activated if a crystal as defined in the
electrical characteristics is used (e.g., TPM crystal). For most crystals used in RKE systems, a shorter time will result.
The CLK output is switched on if the amplitude of the current flowing through the crystal has reached 35% to 80% of its final
value. This is synchronized with the 1.64/1.69MHz CLK output. As a result, the first period of the CLK output is always a full
period. The PLL is then locked <250µs after CLK output activation. This means an additional wait time of ≥ 250µs is
necessary before the PA can be switched on and the data transmission can start. This results in a significantly lower time of
about 0.85ms between enabling the Atmel ATA5756/ATA5757 and the beginning of the data transmission which saves
battery power especially in tire pressure monitoring systems.
The power amplifier is an open-collector output delivering a current pulse which is nearly independent from the load
impedance and can therefore be controlled via the connected load impedance.
This output configuration enables a simple matching to any kind of antenna or to 50. A high power efficiency for the power
amplifier results if an optimized load impedance of ZLoad, opt = 380 + j340 (Atmel ATA5756) at 315MHz and
ZLoad, opt = 280 + j310 (Atmel ATA5757) at 433.92MHz is used at the 3-V supply voltage.
ATA5756/ATA5757 [DATASHEET]
4702M–RKE–09/15
5
4.
Functional Description
If ASK = Low, FSK = Low and ENABLE = open or Low, the circuit is in power-down mode consuming only a very small
amount of current so that a lithium cell used as power supply can work for many years.
If the ENABLE pin is left open, ENABLE is the logical OR operation of the ASK and FSK input pins. This means, the IC can
be switched on by either the FSK of the ASK input.
If the ENABLE pin is Low and ASK or FSK are High, the IC is in idle mode where the PLL, XTO and power amplifier are off
and the microcontroller ports controlling the ASK and FSK inputs can be used to control other devices. This can help to save
ports on the microcontroller in systems where other devices with 3-wire interface are used.
With FSK = High and ASK = Low and ENABLE = open or High, the PLL and the XTO are switched on and the power
amplifier is off. When the amplitude of the current through the crystal has reached 35% to 80% of its final amplitude, the CLK
driver is automatically activated. The CLK output stays Low until the CLK driver has been activated. The driver is activated
synchronously with the CLK output frequency, hence, the first pulse on the CLK output is a complete period. The PLL is then
locked within <250µs after the CLK driver has been activated, and the transmitter is then ready for data transmission.
With ASK = High the power amplifier is switched on. This is used to perform the ASK modulation. During ASK modulation
the IC is enabled with the FSK or the ENABLE pin.
With FSK = Low the switch at pin XTO2 is closed, with FSK = High the switch is open. To achieve a faster start-up of the
crystal oscillator, the FSK pin should be High during start-up of the XTO because the series resistance of the resonator seen
from pin XTO1 is lower if the switch is off.
The different modes of the Atmel® ATA5756/ATA5757 are listed in Table 4-1, the corresponding current consumption values
can be found in the table “Electrical Characteristics” on page 14.
6
Table 4-1.
ATA5756/ATA5757 Modes
ASK Pin
FSK Pin
ENABLE Pin
Mode
Low
Low
Low/open
Power-down mode, FSK switch High Z
Low
Low
High
Power-up, PA off, FSK switch Low Z
Low
High
High/open
Power-up, PA off, FSK switch High Z
High
Low
High/open
Power-up, PA on, FSK switch Low Z
High
High
High/open
Power-up, PA on, FSK switch High Z
Low/High
High
Low
Idle mode, FSK switch High Z
High
Low/High
Low
Idle mode, FSK switch High Z
ATA5756/ATA5757 [DATASHEET]
4702M–RKE–09/15
4.1
Transmission with ENABLE = open
4.1.1
ASK Mode
The Atmel® ATA5756/ATA5757 is activated by ENABLE = open, FSK = High, ASK = Low. The microcontroller is then
switched to external clocking. After typically 0.6ms, the CLK driver is activated automatically (i.e., the microcontroller waits
until the XTO and CLK are ready). After another time period of ≤ 50µs, the PLL is locked and ready to transmit. The output
power can then be modulated by means of pin ASK. After transmission, ASK is switched to Low and the microcontroller
returns back to internal clocking. Then, the Atmel ATA5756/ATA5757 is switched to power-down mode with FSK = Low.
Figure 4-1. Timing ASK Mode with ENABLE not Connected to the Microcontroller
ΔTXTO
> 250µs
FSK
ASK
CLK
Power-down
4.1.2
Power-up,
PA off
Power-up,
PA on
(High)
Power-up,
PA off
(Low)
Power-down
FSK Mode
The Atmel ATA5756/ATA5757 is activated by FSK = High, ASK = Low. The microcontroller is then switched to external
clocking. After typically 0.6ms, the CLK driver is activated automatically (i.e., the microcontroller waits until the XTO and CLK
are ready. After another time period of ≤ 50 µs, the PLL is locked and ready to transmit. The power amplifier is switched on
with ASK = H. The Atmel ATA5756/ATA5757 is then ready for FSK modulation. The microcontroller starts to switch on and
off the capacitor between the crystal load capacitor and GND by means of pin FSK, thus, changing the reference frequency
of the PLL. IF FSK = L the output frequency is lower, if FSK = H output frequency is higher. After transmission, FSK stays
High and ASK is switched to Low and the microcontroller returns back to internal clocking. Then, the Atmel
ATA5756/ATA5757 is switched to power-down mode with FSK = Low.
Figure 4-2. Timing FSK Mode with ENABLE not Connected to the Microcontroller
ΔTXTO
> 250µs
FSK
ASK
CLK
Power-down
Power-up,
PA off
Power-up, Power-up,
PA off
PA on
(fRF = High) (fRF = Low)
Power-down
ATA5756/ATA5757 [DATASHEET]
4702M–RKE–09/15
7
4.2
Transmission with ENABLE = High
4.2.1
FSK Mode
The Atmel® ATA5756/ATA5757 is activated by ENABLE = High, FSK = High and ASK = Low. The microcontroller is then
switched to external clocking. After typically 0.6ms, the CLK driver is activated automatically (i.e., the microcontroller waits
until the XTO and CLK are ready). After another time period of ≤ 50µs, the PLL is locked and ready to transmit. The power
amplifier is switched on with ASK = H. The Atmel ATA5756/ATA5757 is then ready for FSK modulation. The microcontroller
starts to switch on and off the capacitor between the crystal load capacitor and GND by means of pin FSK, thus, changing
the reference frequency of the PLL. IF FSK = L the output frequency is lower, if FSK = H output frequency is higher. After
transmission, ASK is switched to Low and the microcontroller returns back to internal clocking. Then, the Atmel
ATA5756/ATA5757 is switched to power-down mode with ENABLE = Low and FSK = Low.
Figure 4-3. Timing FSK Mode with ENABLE Connected to the Microcontroller
ΔTXTO
> 250µs
ENABLE
FSK
ASK
CLK
Power-down
4.2.2
Power-up,
PA off
Power-up, Power-up,
PA on
PA off
(fRF = High) (fRF = Low)
Power-down
ASK Mode
The Atmel® ATA5756/ATA5757 is activated by ENABLE = High, FSK = High and ASK = Low. After activation the
microcontroller is switched to external clocking. After typically 0.6ms, the CLK driver is activated automatically (the
microcontroller waits until the XTO and CLK are ready). After another time period of ≤ 50 µs, the PLL is locked and ready to
transmit. The output power can then be modulated by means of pin ASK. After transmission, ASK is switched to Low and the
microcontroller returns back to internal clocking. Then, the Atmel ATA5756/ATA5757 is switched to power-down mode with
ENABLE = Low and FSK = Low.
Figure 4-4. Timing ASK Mode with ENABLE Connected to the Microcontroller
ΔTXTO
> 250µs
ENABLE
FSK
ASK
CLK
Power-down
8
ATA5756/ATA5757 [DATASHEET]
4702M–RKE–09/15
Power-up,
PA off
Power-up,
PA on
(High)
Power-up,
PA off
(Low)
Power-down
4.3
Accuracy of Frequency Deviation
The accuracy of the frequency deviation using the XTAL pulling method is about ±20% if the following tolerances are
considered. One important aspect is that the values of C0 and CM of typical crystals are strongly correlated which reduces the
tolerance of the frequency deviation.
Figure 4-5. Tolerances of Frequency Modulation
VS
CStray
XTAL
CM
LM
RS
C0
Crystal equivalent circuit
C4
C5
CSwitch
Using a crystal with a motional capacitance of CM = 4.37fF ±15%, a nominal load capacitance of CLNOM = 18pF and a parallel
capacitance of C0 = 1.30pF correlated with CM results in C0 = 297  CM (the correlation has a tolerance of 10%, so C0 = 267
to 326  CM). If using the internal FSK switch with CSwitch = 0.9pF ±20% and estimated parasites of CStray = 0.7pF ±10%, the
resulting C4 and C5 values are C4 = 10pF ±1% and C5 = 15pF ±1% for a nominal frequency deviation of ±19.3kHz with worst
case tolerances of ±15.8kHz to ±23.2kHz.
4.4
Accuracy of the Center Frequency
The imaginary part of the impedance in large signal steady state oscillation IMXTO, seen into the pin 7 (XTO1), causes some
additional frequency tolerances, due to pulling of the XTO oscillation frequency. These tolerances have to be added to the
tolerances of the crystal itself (adjustment tolerance, temperature stability and ageing) and the influence to the center
frequency due to tolerances of C4, C5, CSwitch and CStray. The nominal value of IMXTO = 110, CSwitch and CStray should be
absorbed into the C4 and C5 values by using a crystal with known frequency and choosing C4 and C5, so that the XTO center
frequency equals the crystal frequency, and the frequency deviation is as expected. Then, from the nominal value, the IMXTO
has ±90 tolerances, using the pulling formula P = –IMXTO  CM  fXTO with fXTO = 13.56MHz and CM = 4.4fF an
additional frequency tolerance of P = ±16.86ppm results. If using crystals with other CM the additional frequency tolerance
can be calculated in the same way. For example, a lower CM = 3.1fF will reduce the frequency tolerance to 11.87ppm, where
a higher CM = 5.5fF increases the tolerance to 21.07ppm.
4.5
CLK Output
An output CLK signal of 1.64MHz (Atmel® ATA5756 operating at 315MHz) and 1.69MHz (Atmel ATA5757 operating at
433.92MHz) is provided for a connected microcontroller. The delivered signal is CMOS-compatible with a High and Low time
of >125ns if the load capacitance is lower than 20pF. The CLK output is Low in power-down mode due to an internal pulldown resistor. After enabling the PLL and XTO the signal stays Low until the amplitude of the crystal oscillator has reached
35% to 80% of its amplitude. Then, the CLK output is activated synchronously with its output signal so that the first period of
the CLK output signal is a full period.
4.5.1
Clock Pulse Take-over by Microcontroller
The clock of the crystal oscillator can be used for clocking the microcontroller. Atmel’s ATARx9x microcontroller family
provides the special feature of starting with an integrated RC oscillator to switch on the Atmel ATA5756/ATA5757’s external
clocking and to wait automatically until the CLK output of the Atmel ATA5756/ATA5757 is activated. After a time period of
250µs the message can be sent with crystal accuracy.
ATA5756/ATA5757 [DATASHEET]
4702M–RKE–09/15
9
4.5.2
Output Matching and Power Setting
The output power is set by the load impedance of the antenna. The maximum output power is achieved with a load
impedance of ZLoad, opt = 380 + j340 (Atmel ATA5756) at 315MHz and ZLoad, opt = 280 + j310 (Atmel ATA5757) at
433.92MHz. A low resistive path to VS is required to deliver the DC current (see Figure 4-6 on page 10).
The power amplifier delivers a current pulse and the maximum output power is delivered to a resistive load if the 0.66pF
output capacitance of the power amplifier is compensated by the load impedance.
At the ANT1 pin, the RF output amplitude is about VS – 0.5V.
The load impedance is defined as the impedance seen from the Atmel ATA5756’s ANT1, ANT2 into the matching network.
Do not mix up this large-signal load impedance with a small-signal input impedance delivered as an input characteristic of
RF amplifiers.
The latter is measured from the application into the IC instead of from the IC into the application for a power amplifier.
The 0.66pF output capacitance absorbed into the load impedance a real impedance of 684 (Atmel ATA5756) at 315MHz
and 623 (Atmel ATA5757) at 433.92MHz should be measured with a network analyses at pin 5 (ANT1) with the Atmel
ATA5756/ATA5757 soldered, an optimized antenna connected and the power amplifier switched off.
Less output power is achieved by lowering the real parallel part where the parallel imaginary part should be kept constant.
Lowering the real part of the load impedance also reduces the supply voltage dependency of the output power.
Output power measurement can be done with the circuit as shown in Figure 4-6. Please note that the component values
must be changed to compensate the individual board parasitics until the Atmel ATA5756/ATA5757 has the right load
impedance. Also, the damping of the cable used to measure the output power must be calibrated.
Figure 4-6. Output Power Measurement Atmel ATA5756/ATA5757
VS
C1 = 1nF
L1 = 68nH/ 39nH
ANT1
Power
meter
Z = 50Ω
ZLopt
C2 = 2.2pF/ 1.8pF
Rin
50Ω
ANT2
Table 4-2 and Table 4-3 show the output power and the supply current versus temperature and supply voltage.
Table 4-2.
10
Output Power and Supply Current versus Temperature and Supply
Voltage for the Atmel ATA5756 with ZLoad = 380 + j340 (Correlation Tested)
Ambient Temperature
VS = 2.0V
(dBm/mA)
VS = 3.0V
(dBm/mA)
VS = 3.6V
(dBm/mA)
Tamb = –40°C
3.1 ±1.5/7.2
6.1 +2/–3/7.7
7.1 +2/–3/7.9
Tamb = +25°C
3.0 ±1.5/7.5
6.0 ±2/8.1
7.4 ±2/8.3
Tamb = +85°C
3.0 ±1.5/7.5
5.8 +2/–3/8.2
7.2 +2/–3/8.5
Tamb = +125°C
2.5 ±1.5/7.6
5.5 +2/–3/8.2
6.5 +2/–3/8.5
ATA5756/ATA5757 [DATASHEET]
4702M–RKE–09/15
Table 4-3.
4.6
Output Power and Supply Current versus Temperature and Supply
Voltage for the Atmel ATA5757 with ZLoad = 280 + j310 (Correlation Tested)
Ambient Temperature
VS = 2.0 V
(dBm/mA)
VS = 3.0 V
(dBm/mA)
VS = 3.6 V
(dBm/mA)
Tamb = –40°C
3.3 ±1.5/7.6
6.2 +2/–3/8.1
7.1 +2/–3/8.4
Tamb = +25°C
3.0 ±1.5/8.0
6.0 ±2/8.5
7.5 ±2/8.8
Tamb = +85°C
2.8 ±1.5/8.0
5.7 +2/–3/8.6
6.8 +2/–3/8.8
Tamb = +125°C
2.7 ±1.5/8.1
5.5 +2/–3/8.7
6.6 +2/–3/8.9
Application Circuits
For the supply voltage blocking capacitor C3, a value of 68nF/X7R is recommended (see Figure 4-7 on page 12 and Figure
4-8 on page 13). C1 and C2 are used to match the loop antenna to the power amplifier. For C2, two capacitors in series
should be used to achieve a better tolerance value and to enable it to realize ZLoad,opt by using capacitors with standard
values.
Together with the pins of Atmel ATA5756 and the PCB board wires, C1 forms a series resonance loop that suppresses the 1st
harmonic, hence the position of C1 on the PCB is important. Normally, the best suppression is achieved when C1 is placed
as close as possible to the pins ANT1 and ANT2.
The loop antenna should not exceed a width of 1.5mm, otherwise the Q-factor of the loop antenna is too high.
L1 (50nH to 100nH) can be printed on the PCB. C4 should be selected so that the XTO runs on the load resonance frequency
of the crystal. Normally, a value of 10pF results in a 12pF load-capacitance crystal due to the board parasitic capacitances
and the inductive impedance of the XTO1 pin.
ATA5756/ATA5757 [DATASHEET]
4702M–RKE–09/15
11
Figure 4-7. ASK Application Circuit
S1
BPXY
S2
VDD
1
ATARx9x
BPXY
VS
VSS
20
BPXY
OSC1
7
BPXY
ATA5756/
ATA5757
Power up/down
CLK
1
EN
f
ENABLE
10
8
f
ASK
2
24/
32
GND
9
C3
OR
PDF
FSK
3
VS
8
CP
C2
VS
Ampl. OK
ANT2
4
Loop
Antenna
XTO
XTO1
7
LF
C1
C4
EN
ANT1
5
L1
VS
12
ATA5756/ATA5757 [DATASHEET]
4702M–RKE–09/15
XTAL
VCO
PA
PLL
XTO2
6
Figure 4-8. FSK Application Circuit
S1
BPXY
S2
VDD
1
ATARx9x
BPXY
VS
VSS
20
BPXY
OSC1
7
BPXY
ATA5756/
ATA5757
Power up/down
CLK
1
EN
f
ENABLE
10
8
f
ASK
2
24/
32
GND
9
C3
OR
PDF
FSK
3
VS
8
CP
C2
VS
Ampl. OK
ANT2
4
Loop
Antenna
XTO
XTO1
7
XTAL
LF
C1
EN
ANT1
5
L1
VCO
PA
PLL
XTO2
6
C5
C4
VS
ATA5756/ATA5757 [DATASHEET]
4702M–RKE–09/15
13
Figure 4-9. ESD Protection Circuit
VS
ANT1
CLK
ASK
FSK
ANT2
XTO2
XTO1
ENABLE
GND
5.
Absolute Maximum Ratings
Parameters
Symbol
Minimum
Maximum
Unit
Supply voltage
VS
5
V
Power dissipation
Ptot
100
mW
Junction temperature
Tj
150
C
Storage temperature
Tstg
–55
125
C
Ambient temperature
Tamb1
–55
125
C
Ambient temperature in power-down mode for
15 minutes without damage with VS ≤ 3.2V
VENABLE < 0.25V or ENABLE is open,
VASK < 0.25V, VFSK < 0.25V
Tamb2
175
C
(VS + 0.3)(1)
V
Input voltage
VmaxASK
–0.3
Note:
1. If VS + 0.3 is higher than 3.7V, the maximum voltage will be reduced to 3.7V.
6.
Thermal Resistance
Parameters
Junction ambient
7.
Symbol
Value
Unit
RthJA
170
K/W
Electrical Characteristics
VS = 2.0V to 3.6V, Tamb = –40°C to +125°C unless otherwise specified.
Typical values are given at VS = 3.0V and Tamb = 25°C. All parameters are referred to GND (Pin 9).
CM = 4.37fF, C0 = 1.3pF, CLNOM = 18pF, C4 = 10pF, C5 = 15pF and RS ≤ 60
Parameters
Test Conditions
Supply current,
power-down mode
VENABLE < 0.25V or ENABLE is open,
VASK < 0.25V, VFSK < 0.25V
Tamb = 25C
Tamb = –40C to +85C
Tamb = –40C to +125C
Supply current, idle mode
VENABLE < 0.25V, VS ≤ 3.2V
ASK,FSK can be Low or High
IS_IDLE
Supply current, power-up, PA off,
FSK switch High Z
VS ≤ 3.2V, VFSK > 1.7V,
VASK < 0.25V ENABLE is open
IS
14
ATA5756/ATA5757 [DATASHEET]
4702M–RKE–09/15
Symbol
IS_Off
Min.
Typ.
Max.
Unit
1
100
350
7,000
nA
nA
nA
100
µA
4.6
mA
3.6
7.
Electrical Characteristics (Continued)
VS = 2.0V to 3.6V, Tamb = –40°C to +125°C unless otherwise specified.
Typical values are given at VS = 3.0V and Tamb = 25°C. All parameters are referred to GND (Pin 9).
CM = 4.37fF, C0 = 1.3pF, CLNOM = 18pF, C4 = 10pF, C5 = 15pF and RS ≤ 60
Parameters
Test Conditions
Symbol
Min.
Supply current, power-up, PA on,
FSK switch High Z
VS ≤ 3.2 V, CCLK ≤ 10pF
VFSK > 1.7V, VASK > 1.7V
ENABLE is open
ATA5756
ATA5757
IS_Transmit1
Supply current, power-up, PA on,
FSK Low Z
VS ≤ 3.2V, CCLK ≤ 10pF
VFSK< 0.25V, VASK > 1.7V
ENABLE is open
Atmel ATA5756
Atmel ATA5757
IS_Transmit2
Output power
VS = 3.0V, Tamb = 25°C,
f = 315MHz for Atmel ATA5756,
ZLoad, opt = (380 + j340)
f = 433.92MHz for Atmel ATA5757,
ZLoad, opt = (280 + j310)
POut
4
Output power for the full
temperature and supply voltage
range
Tamb = –40°C to +125°C,
VS = 2.0V to 3.2V
POut
1
Spurious emission
fCLK = fXT0/8
Load capacitance at pin CLK ≤ 20pF
f0 ± fCLK
f0 ± fXT0
other spurious are lower
Harmonics
With 50 matching network according
to Figure 4-6 on page 10
2nd
3rd
Oscillator frequency XTO
(= phase comparator frequency)
fXTO = f0/24 Atmel ATA5756
fXTO = f0/32 Atmel ATA5757
fXTAL = resonant frequency of the
XTAL, CM  4.37fF, load capacitance
selected accordingly
Tamb = –40°C to +85°C
Tamb = –40°C to +125°C
fXTO
Imaginary part of XTO1
Impedance in steady state
oscillation
Since pulling P is
P = -IMXTO  CM  fXTO
fXTO can be calculated out of IMXTO
with CM = 4.37fF
Real part of XTO1 impedance in
small signal oscillation
Crystal oscillator start-up time
Spour
Typ.
Max.
Unit
8.1
8.5
9.8
10.5
mA
mA
8.4
8.8
10.2
11.0
mA
mA
6
8
dBm
8.2
dBm
–42
–60
dBc
–16
–15
dBc
dBc
–14.0
–17.5
fXTAL
fXTAL
+14.0
+17.5
ppm
ppm
IMXTO
j20
j110
j200

This value is important for crystal
oscillator start-up
REXTO
–650
–1100
Time between ENABLE of the IC with
FSK = H and activation of the CLK
output. The CLK is activated
synchronously to the output frequency
if the current through the XTAL has
reached 35% to 80% of its maximum
amplitude. Crystal parameters:
CM = 4.37fF, C0 = 1.3pF, CLNOM = 18pF,
C4 = 10pF, C5 = 15pF, RS ≤ 60
TXTO
0.6

1.4
ATA5756/ATA5757 [DATASHEET]
4702M–RKE–09/15
ms
15
7.
Electrical Characteristics (Continued)
VS = 2.0V to 3.6V, Tamb = –40°C to +125°C unless otherwise specified.
Typical values are given at VS = 3.0V and Tamb = 25°C. All parameters are referred to GND (Pin 9).
CM = 4.37fF, C0 = 1.3pF, CLNOM = 18pF, C4 = 10pF, C5 = 15pF and RS ≤ 60
Parameters
Test Conditions
XTO drive current
Current flowing through the crystal in
steady state oscillation (peak-to-peak
value)
IDXTO
Locking time of the PLL
Time between the activation of CLK
and when the PLL is locked (transmitter
ready for data transmission)
TPLL
PLL loop bandwidth
Symbol
Min.
Typ.
Max.
300
Unit
µApp
250
µs
fLoop_PLL
250
LPLL
–85
–76
dBc/Hz
Lat1M
Lat36M
–90
–121
–84
–115
dBc/Hz
dBc/Hz
317
448
MHz
MHz
In loop phase noise PLL
25kHz distance to carrier
Phase noise VCO
at 1MHz
at 36MHz
Frequency range of VCO
Atmel ATA5756
Atmel ATA5757
fVCO
Clock output frequency (CMOS
microcontroller compatible)
Atmel ATA5756
Atmel ATA5757
fCLK
Clock output minimum High and
Low time
CLoad ≤ 20pF, High = 0.8 Vs,
Low = 0.2 VS, fCLK < 1.7MHz
TCLKLH
310
432
kHz
f0/192
f0/256
MHz
125
ns
Series resonance resistance of
For proper detection of the XTO
the resonator seen from pin XTO1 amplitude
Rs_max
150

Capacitive load at Pin XTO1
CL_max
5
pF
20
kHz
FSK modulation frequency rate
This corresponds to 20kBaud in
Manchester coding and 40kBaud in
NRZ coding
FSK switch OFF resistance
High Z
RSWIT_OFF
50
FSK switch OFF capacitance
High Z capacitance
CSWIT_OFF
0.75
FSK switch ON resistance
Low Z
RSWIT_ON
ASK modulation frequency rate
Duty cycle of the modulation signal =
50%, this corresponds to 20kBaud in
Manchester coding and 40kBaud in
NRZ coding
fMOD_ASK
ASK input
Low level input voltage
High level input voltage
Input current high
FSK input
ENABLE input
16
0
k
0.9
1.1
pF
130
175

0
20
kHz
VIl
VIh
IIn
1.7
0.25
VS
30
V
V
µA
Low level input voltage
High level input voltage
Input current high
VIl
VIh
IIn
1.7
0.25
VS
30
V
V
µA
Low level input voltage
High level input voltage
Input current high
Input current low
VIl
VIh
IInh
IInl
0.25
VS
40
40
V
V
µA
µA
ATA5756/ATA5757 [DATASHEET]
4702M–RKE–09/15
fMOD_FSK
1.7
–40
–40
Extended Type Number
Package
Remarks
ATA5756C-6DQY-66
TSSOP10
Pb-free
ATA5757C-6DQY-66
TSSOP10
Pb-free
Package Information TSSOP10
0.85±0.1
3±0.1
3±0.1
0.25
0.15
9.
Ordering Information
1.1 max
8.
3.8±0.3
0.5 nom.
4.9±0.1
4 x 0.5 = 2 nom.
10 9 8 7 6
technical drawings
according to DIN
specifications
Dimensions in mm
1 2 3 4 5
Not indicated tolerances ±0.05
09/16/05
TITLE
Package Drawing Contact:
[email protected]
Package: TSSOP
(acc. to JEDEC Standard MO-187)
GPC
DRAWING NO.
REV.
6.543-5095.01-4
3
ATA5756/ATA5757 [DATASHEET]
4702M–RKE–09/15
17
10.
Revision History
Please note that the following page numbers referred to in this section refer to the specific revision mentioned, not to this
document.
Revision No.
History
4702M-RKE-09/15
 Section 8 “Ordering Information” on page 17 updated
4702L-RKE-03/14
 Put datasheet in the latest template
4702K-RKE-11/12
 Section 8 “Ordering Information” on page 17 updated
 Put datasheet in the latest template
4702J-RKE-07/08
 Page1: PB-free logo deleted
 Page 18: Ordering information updated
 Put datasheet in the latest template
4702I-RKE-11/05
 First page: Pb-free logo added
Page 18: Ordering information and package drawing updated
4702H-RKE-09/04
Electrical Characteristics table, page 15, row “Output power for the full...”.
-> maximum value updated
4702G-RKE-08/04
 Electrical Characteristics table, page 15, row “Output power variation...”.
-> the word “variation” deleted
4702F-RKE-08/04
Preliminary deleted
 Abs. Max. Ratings table (page 14): row “Input voltage” added
4702E-RKE-07/04
18
Abs. Max. Ratings table (page 14): table note 1 added
 El. Char. table (page 17): rows “ASK input”, “FSK input“, “ENABLE input” maximum
values updated
ATA5756/ATA5757 [DATASHEET]
4702M–RKE–09/15
XXXXXX
Atmel Corporation
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T: (+1)(408) 441.0311
F: (+1)(408) 436.4200
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© 2015 Atmel Corporation. / Rev.: 4702M–RKE–09/15
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