Atmel ATA5283 - Manual (Page 11)

11
4598H–AUTO–03/07
ATA5283
3 Automatic Gain Control
3.1 Preamble detection time
V
IN
≥
3 mV
rms
at
125 kHz
t
DAGC
192 Periods B
3.2 AGC adjustment time
f = 125 kHz
V
IN
= 1 mV
rms
V
IN
= 3 mV
rms
V
IN
= 30 mV
rms
V
IN
= 100 mV
rms
V
IN
= 1V
rms
t
AGC
t
AGC
t
AGC
t
AGC
t
AGC
0
48
220
292
450
512
Periods C
3.3
Signal change rate
(gap detection) Coil input signal 100%
to 37% (
τ
)
1 t
EOS
20 Periods C
3.4
AGC correction time
(no gap detection)
Coil input signal:
50 to 100% changing
1 t
CORR
52 Periods C
Coil input signal:
100 to 50% changing
1 t
CORR
208 Periods C
3.5 Data rate (Q < 20) 125 kHz ASK DR 4 Kb/s A
3.6 Delay time RF signal to data 125 kHz ASK t
ON
40 µs A
3.7 Delay time RF signal to data 125 kHz ASK t
OFF
40 µs A
4 Interface
4.1 Reset input level high 5 V
HRESET
0.8
×
V
DD
V
DD
V A
4.1.1 Reset pulse width V
RESET
= V
DD
5 t
RESET
20 µs A
4.2 Reset input level low 5 V
LRESET
0
0.2
×
V
DD
V C
4.3
Reset input leakage current
low
V
RESET
= V
SS
5 I
IL
-0.2 0 µA A
4.4
Reset input leakage current
high
V
RESET
= V
DD
5 I
IH
0 0.2 µA A
4.5 N_WAKEUP output level high I
NWAKEUP
= –100 µA 7 V
HNWAKE
0.8
×
V
DD
V
DD
V A
4.6 N_WAKEUP output level low I
NWAKEUP
= 100 µA 7 V
LNWAKE
0 0.2
×
V
DD
V A
4.7 N_DATA output level high I
N_DATA
= –100 µA 6 V
HNDATA
0.8
×
V
DD
V
DD
V A
4.8 N_DATA output level low I
N_DATA
= 100 µA 6 V
LNDATA
0 0.2
×
V
DD
V A
5 Power Supply and Reset
5.1 V
DD
power on reset threshold V
POR
1 1.5 1.9 V A
5.2 Power-up time
Switch on V
DD
to circuit
active
t
PON
100 ms C
5.2.1
Standby reactivation delay
after pulse reset
f = 125 kHz T
Sbydel
800 µs C
5.3
RESET reactivation caused by
negative spikes on V
DD
t
BDN
= 500 ns 7 t
RST
10 200 µs C
7. Electrical Characteristics (Continued)
V
SS
= 0V, V
DD
= 2V to 3.8V, T
amb
= –40
°
C to +105°C, characterized up to 125°C, unless other specified
No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type*
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter