Datasheet

AD9940
Rev. 0 | Page 4 of 20
ANALOG SPECIFICATIONS
f
CLI
= 56 MHz, AVDD = OVDD = DVDD = TCVDD = 3.0 V, −25°C to +85°C, unless otherwise noted.
Table 2.
Parameter Min Typ Max Unit Notes
CDS
Gain 5.0 5.5 6.0 dB
Allowable CCD Reset Transient
1
500 mV
Maximum Input Range Before Saturation
1
1 V p-p
Maximum CCD Black Pixel Amplitude
1
±50 mV
Peak Nonlinearity, 500 mV Input Signal 0.2 % FS
Power Supply Rejection (PSR) 36 dB Measured with step change on supply
ANALOG OUTPUTS
2
Typical DIFFP Output Signal Range 1.2 2.2 V 1.2 V corresponds to black level
Typical DIFFN Output Signal Range 1.2 2.2 V 2.2 V corresponds to black level
Typical Common Mode Level 1.7 V Midscale voltage where DIFFP = DIFFN
Maximum Differential Output Voltage Swing 2 V Defined as DIFFP − DIFFN
Output Voltage Compliance 1.0 2.4 V Limitation of output swing into external load
Maximum Load Capacitance 24 pF Value for each output (AD9941 C
IN
is < 24 pF)
Minimum Load Resistance (if required) 5,000 Ω
Only use resistive loading if required by the
differential receiver. Proper dc biasing should
be used to be compatible with levels in
Figure 3
1
Input signal characteristics are defined in Figure 2.
2
Output signal characteristics are defined in Figure 3.
50mV TYP
OPTICAL BLACK PIXEL
500mV TYP
RESET TRANSIENT
850mV TYP
INPUT SIGNAL RANGE
05261-002
Figure 2. Input Signal Characteristics
2.2V
1V MAX OUTPUT SIGNAL SWING, DIFFP AND DIFFN
2V p-p MAX DIFFERENTIAL SIGNAL, DIFFP–DIFFN
1.2V
DIFFP
GND
DIFFN
1.7V
BLACK
LEVEL
WHITE
LEVEL
05261-015
Figure 3. Output Signal Characteristics