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PDF AK8456 Data sheet ( Hoja de datos )
| Número de pieza | AK8456 | |
| Descripción | 3 channel input 16bit 30MSPS Video ADC | |
| Fabricantes | AKM | |
| Logotipo |  |
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[AK8456]
AK8456
3 channel input 16bit 30MSPS Video ADC with LED driver
1. General Description
AK8456 is an AFE for three channels contact image sensor (CIS). AK8456 has offset adjusting DAC,
digital programmable gain amplifier (PGA) and LED drivers. AK8456 is suitable for multi-function
printer and image scanner.
2. Feature
Input Block
Channel number
3 channel (1 channel mode is available)
Range
1.3Vpp (min.)
Gain 0dB/6dB
ADC
Maximum conversion ratio
30MSPS
10MSPS/ch @ 3-channel mode
30MSPS/ch @ 1-channel mode
Resolution
16bit (Straight binary code/Gray code)
Black correction DAC
Range
Resolution
369mV (Equivalent input voltage) ＜±250mV(min.)＞
6bit
Digital PGA
Range
0dB~18dB
Resolution
8bit
Output Format
8bit × 2
LED Current
67.2mA/ch (typ.) @ Maximum setting
CPU I/F
Adjustable by 12.5% resolution channel independently
3-wire serial interface
Supply Voltage
Power Consumption
AFE: 3.3V0.3V, LED driver: 4.5V~5.7V
190 mW (typ.)：Except LED drive current.
Operating Temperature 0C~70C
Package
36pin QFN (Exposed Die Pad), 0.4mm pitch, 5mm5mm
014002433-E-00
-1-
2014/06
1 page  
5. Pin allocation and Functions
[AK8456]
D0 28
DVO 29
ADCK 30
SHD 31
AVDD 32
AVO 33
VRP 34
ISET 35
VDC 36
AK8456
Top View
18 LED_B
17 LVSS
16 LED_G
15 LVSS
14 LED_R
13 LVDD
12 LEDEN_B
11 LEDEN_G
10 LEDEN_R
Note) Connect under side thermal exposed PAD with AVSS.
Fig.2 Pin Layout
Pin Functions
No. Name
1 CISIN0
2 AVDD
3 CISIN1
4 AVDD
5 CISIN2
6 RESETB
7 SDENB
8 SCLK
9 SDATA
10 LEDEN_R
IO Standby Description
(note 2)
I --- Sensor Signal Input
P --- Analog Supply
I --- Sensor Signal Input
P --- Analog Supply
I --- Sensor Signal Input
I --- Reset Input, Active Low
Include Pull-up Resistance 100k (typ.)
I --- Serial Interface Data Enable
I --- Serial Interface Clock Input
IO High-Z Serial Interface Data Input and Output
I --- LED_R Control Signal Input
Include Pull-down Resistance 50k (typ.)
014002433-E-00
-5-
2014/06
5 Page 
[AK8456]
Switching Characteristics
(Unless otherwise specified, AVDD=OVDD=3.0V~3.6V, Ta=0~70C)
No. Item
Pin Min. Typ. Max. Unit Remarks
1 ADCK Cycle (T)
ADCK 33.3
2000 ns
2 ADCK Low Width
ADCK 15
ns
3 ADCK High Width
ADCK 15
ns
3 3ch Normal Output
4 SHD Cycle
SHD
6 clocks 3ch Cascade Output
1 1ch Mode
5 SHD Pulse Width
SHD
8
ns
6
SHD Setup Time
（to ADCK）
SHD
2
ns
7
SHD Delay Time
（to ADCK）
SHD
10
ns
8 SHD Aperture Delay
SHD
2.5 ns
D0~7 Delay
9 （to ADCK）
D7~D0
2
Hold, Setup
10 ns CL=10pF
(Note 1)
10
Pipeline Delay
(ADCK unit)
D7~D0
11
clocks
3ch Mode
1ch Mode
SHD=”H” Prohibited
1T+10
3ch Normal Output
11 Region (to First SHD 4T+10
ns 3ch Cascade Output
ADCK after SHD)
12 D0~7 Enable Time
13 D0~7 Disable Time
D7~D0
D7~D0
10
0
2.4
1ch Mode
8.2 ns Cascade Output
7.2 ns Cascade Output
These specifications refer to point crossing levels that defined in DC characteristics.
(Note1) Refer to points ADCK, D7~D0 cross 50% of supply voltage. This delay is under ADCK rise
time tr and fall time tf are 1.65ns.
014002433-E-00
- 11 -
2014/06
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AK8456.PDF ] | |
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