TH7841A Datasheet, PDF (8/12 Pages) ATMEL Corporation – Linear CCD Image Sensor (2048 Pixels)

Table 6. Selection of Operating Modes
Option
Implementation
Note
No Sampling
Φ_ECHA (3) and Φ_ECHB (25) Connected to VDD
SΦ_ECHA (4) and SΦ_ECHB (24) Unconnected
(1)
V_INH (16) Connected to V_DD
Sampling By External Clocks
Sampling Clocks Connected to Φ_ECHA - Φ_ECHB
SΦ_ECHA and SΦ_ECHB Unconnected
V_INH (16) Connected to V_DD
See Figure 4 for sampling
clock timing ⁽¹⁾
Reset Control By External Clocks
Ext. Φ_RA on Φ_RA (5) Input
Ext. Φ_RB on Φ_RB (21) Input
See Figure 4 for
reset clock timing
Note: 1. Drain supply current I_DD decreases from 10 mA to 8 mA typically when internal sampling clock is disabled (V_INH = V_DD =
15V).
Table 7. External ΦRA, ΦRB, ΦECHA, ΦECHB Clocks Characteristics
Values
Parameter
Symbol
Logic
Min
Typ
Max
Unit
External Reset Clock
Φ_RA, Φ_RB,
High
12
13
14
V
Sampling Clock
Φ_ECHA, Φ_ECHB
Low
0.0
0.4
0.6
V
Reset And Sampling Clock
Capacitance
CΦ_RA
CΦ_RB
CΦ_ECHA
CΦ_ECHB
10
15
pF
Insertion of a serial resistor (typically 100Ω) at the driver output avoids spurious negative transients.
8 TH7841A
1998A–IMAGE–05/02