U3745BM Datasheet, PDF (25/29 Pages) ATMEL Corporation – UHF ASK RECEIVER IC

U3745BM
Electrical Characteristics (Continued)
All parameters refer to GND, V_S = 5 V, T_amb = 25°C, f₀ = 433.92 MHz and f₀ = 315 MHz, unless otherwise specified. The
possible operating range refer to different circuit conditions: V_S = 4.5 V to 5.5 V, T_amb = -40°C to +85°C
Parameters
Test Conditions
Symbol
Min.
Typ.
Max. Unit
Threshold voltage for reset
Digital Ports
V_ThRESET
1.95
2.8
3.75
V
Data output
- Saturation voltage LOW
- Internal pull-up resistor
- Maximum time constant
- Maximum capacitive load
POUT output
- Saturation voltage LOW
- Saturation voltage HIGH
ASK input
- High-level input voltage
ENABLE input
- Low-level input voltage
- High-level input voltage
MODE input
- Low-level input voltage
- High-level input voltage
TEST input
- Low-level input voltage
I_ol = 1 mA
t = C_L (R_pup//R_Ext)
without ext. pull-up resistor
R_ext = 5 kW
I_POUT = 1 mA
I_POUT = -1 mA
ASK
Idle mode
Active mode
Division factor = 10
Division factor = 14
Test input must always be set to LOW
V_OI
R_Pup
t
C_L
C_L
V_Ol
V_Oh
V_Ih
V_Il
V_Ih
V_Il
V_Ih
V_Il
0.08
0.3
V
39
50
61
kW
2.5
µs
41
pF
540
pF
0.08
0.3
V
V_S-0.3V V_S-0.14V
V
0.8 ´ V_S
V
0.8 ´ V_S
0.2 ´ V_S
V
V
0.8 ´ V_S
0.2 ´ V_S
V
V
0.2 ´ V_S
V
Electrical Characteristics
All parameters refer to GND, V_S = 5 V, T_amb = 25°C, f₀ = 433.92 MHz and f₀ = 315 MHz, unless otherwise specified. The
possible operating range refer to different circuit conditions: V_S = 4.5 V to 5.5 V, T_amb = -40°C to +85°C
6.76438-Mhz Osc.
(Mode 1)
4.90625-Mhz Osc.
(Mode 0)
Variable Oscillator
Parameter
Test Condition
Symbol
Min.
Typ. Max. Min. Typ.
Max. Min.
Typ.
Max. Unit
Basic Clock Cycle of the Digital Circuitry
Basic clock
cycle
MODE = 0 (USA)
MODE = 1
(Europe)
T_Clk
2.0697
2.0383
1/(f_XTO/10)
µs
1/(f_XTO/14)
µs
Extended
basic clock
cycle
BR_Range0
BR_Range1
BR_Range2
BR_Range3
T_XClk
16.6
8.3
4.1
2.1
16.3
8.2
4.1
2.0
8 ´ T_Clk
µs
4 ´ T_Clk
µs
2 ´T_Clk
µs
1 ´ T_Clk
µs
Polling Mode
Sleep time
Sleep and XSleep
are defined in the
OPMODE register
T_Sleep
Sleep ´
X_Sleep ´
1024 ´
2.0697
Sleep ´
X_Sleep ´
1024 ´
2.0383
Sleep ´
ms
X_Sleep ´
1024 ´ T_Clk
Start-up time
BR_Range0
BR_Range1
BR_Range2
BR_Range3
T_Startup
1855
1061
1061
663
1827
1045
1045
653
896.5
µs
512.5
µs
512.5
µs
320.5
µs
´ T_Clk
25
4663A–RKE–06/03