参数资料
| 型号： | AD8384ASVZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 18/24页 |
| 文件大小： | 0K |
| 描述： | IC DRIVER LCD 6CH 10BIT 80-TQFP |
| 产品变化通告： | AD8384ASVZ Discontinuation 28/Feb/2012 |
| 标准包装： | 1 |
| 系列： | DecDriver™ |
| 显示器类型： | LCD |
| 接口： | 3 线串口 |
| 电流 - 电源： | 40mA |
| 电源电压： | 9 V ~ 18 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 80-TQFP 裸露焊盘 |
| 供应商设备封装： | 80-TQFP-EP（12x12） |
| 包装： | 托盘 |
AD8384
VBIAS GENERATION—V1, V2 INPUT PIN
FUNCTIONALITY
In order to avoid image flicker, a symmetrical ac voltage is
required and a bias voltage of approximately 1 V minimum
must be maintained across the pixels of HTPS LCDs. The
AD8384 provides two methods of maintaining this bias voltage.
Internal Bias Voltage Generation
Standard systems that internally generate the bias voltage
reserve the upper-most code range for the bias voltage, and use
the remaining code range to encode the video for gamma
correction. In these systems, a high degree of ac symmetry is
guaranteed by the AD8384.
APPLICATIONS CIRCUIT
The circuit in Figure 18 ensures VBIAS symmetry to within
1 mV with a minimum component count. Bypass capacitors are
not shown for clarity.
typically produces a symmetrical output at 85°C when its
supply, (V+) – (V–), is at 7.2 V.
AVCC = 15.5V
VZ = 5.1V
The V1 and V2 inputs in these systems are tied together and are
1
–IN
3
V+
5
V2 = 8V
AD8384
V2
VCOM = 7V
2 VCOM
AD8132
R2 = 1k ?
8
+IN
V–
4
V1 = 6V
V1
6
AD8384
VFS = 5V
R1 = 6k ?
DVCC = 3.3V
VCOM
V2
V1
VCOM
VBIAS = 1V
VBIAS = 1V
820
1023
Figure 18. External VBIAS Generator with the AD8132
VFS = 5V
RESERVED
CODE
RANGE
VFS = 4V
Figure 17. V1, V2 Connection and Transfer Function
in a Typical Standard System
External Bias Voltage Generation
V2
VCOM
V1
VFS = 4V
VBIAS = 1V
VBIAS = 1V
1023
In systems that require improved brightness resolution and
higher accuracy, the V1 and V2 inputs, connected to external
voltage references, provide the necessary bias voltage (VBIAS)
while allowing the full code range to be used for gamma
correction.
To ensure a symmetrical ac voltage at the outputs of the
AD8384, VBIAS must remain constant for both states of INV.
Therefore, V1 and V2 are defined as
Figure 19. AD8384 Transfer Function in a Typical High Accuracy System
8.75
7.50
6.25
5.00
3.75
V1 = VCOM – VBIAS
2.50
T A = 85°C
T A = 25°C
1.25
V2 = VCOM + VBIAS
0.00
–1.25
–2.50
–3.75
–5.00
–6.25
–7.50
–8.75
5.7
6.2
6.7
7.2
7.7
8.2
8.7
9.2
9.7
10.2
10.7
[V+] – [V–] (V)
Figure 20. Typical Asymmetry at the Outputs of the AD8132 vs. Its Power
Supply for the Application Circuit
Rev. 0 | Page 18 of 24
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