TL851CDR Datasheet, PDF (2/13 Pages) Texas Instruments – SONAR RANGING CONTROL

TL851
SONAR RANGING CONTROL
SLSS004 – SEPTEMBER 1983 – REVISED MARCH 1988
GAIN CONTROL OUTPUT TABLE
STEP
NUMBER ^GCD
GCC
GCB
GCA
TIME (ms)
FROM INITIATE↑^†
0
L
L
L
L
2.38 ms
1
L
L
L
H
2
L
L
L
L
5.12 ms
7.87 ms
3
L
L
H
H
10.61 ms
4
L
H
L
L
13.35 ms
5
L
H
L
H
16.09 ms
6
L
H
H
L
18.84 ms
7
L
H
H
H
21.58 ms
8
H
L
L
L
27.07 ms
9
H
L
L
H
32.55 ms
10
H
L
H
L
11
H
L
H
H
38.04 ms
INIT ↓
† _{This is the time to the end of the indicated step and assumes a nominal}
420-kHz ceramic resonator.
functional block diagram
FILT
13
VCC
1
420-kHz
Oscillator
G
XTAL1 ¹¹
XTAL2 ¹²
14
INIT
Filtered Supply
Frequency
Divider
Gain Step
Counter
CT≤16
+ 8.5
+ 4.5
CLR
+
CT ≥ 208
CLR CT > 16
Transmit Enable
10 _OSC
2 _XMIT
5 _GCA
6 _GCB
7 _GCC
4 _GCD
15
BINH
BLNK ¹⁶
8
REC
GND ³
Blanking
Latch
S
R
Internal
Blanking
1.2 V
Echo
Latch
R
S
9
ECHO
2
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265