Datasheet
AD9958 Data Sheet
Rev. B | Page 4 of 44
SPECIFICATIONS
AVDD and DVDD = 1.8 V ± 5%; DVDD_I/O = 3.3 V ± 5%; T = 25°C; R
SET
= 1.91 kΩ; external reference clock frequency = 500 MSPS
(REFCLK multiplier bypassed), unless otherwise noted.
Table 1.
Parameter Min Typ Max Unit Test Conditions/Comments
REFERENCE CLOCK INPUT CHARACTERISTICS
See
Figure 34 and Figure 35
Frequency Range
REFCLK Multiplier Bypassed 1 500 MHz
REFCLK Multiplier Enabled 10 125 MHz
Internal VCO Output Frequency Range
VCO Gain Control Bit Set High
1
255 500 MHz
VCO Gain Control Bit Set Low
1
100 160 MHz
Crystal REFCLK Source Range 20 30 MHz
Input Level 200 1000 mV Measured at each pin (single-ended)
Input Voltage Bias Level 1.15 V
Input Capacitance 2 pF
Input Impedance 1500 Ω
Duty Cycle with REFCLK Multiplier Bypassed 45 55 %
Duty Cycle with REFCLK Multiplier Enabled 35 65 %
CLK Mode Select (Pin 24) Logic 1 Voltage 1.25 1.8 V 1.8 V digital input logic
CLK Mode Select (Pin 24) Logic 0 Voltage 0.5 V 1.8 V digital input logic
DAC OUTPUT CHARACTERISTICS Must be referenced to AVDD
Resolution 10 Bits
Full-Scale Output Current 1.25 10 mA
Gain Error −10 +10 % FS
Channel-to-Channel Output Amplitude Matching Error −2.5 +2.5 %
Output Current Offset 1 25 µA
Differential Nonlinearity ±0.5 LSB
Integral Nonlinearity ±1.0 LSB
Output Capacitance 3 pF
Voltage Compliance Range AVDD −
0.50
AVDD +
0.50
V
Channel-to-Channel Isolation 72 dB
DAC supplies tied together (see
Figure 19)
WIDEBAND SFDR The frequency range for wideband SFDR
is defined as dc to Nyquist
1 MHz to 20 MHz Analog Output −65 dBc
20 MHz to 60 MHz Analog Output −62 dBc
60 MHz to 100 MHz Analog Output −59 dBc
100 MHz to 150 MHz Analog Output −56 dBc
150 MHz to 200 MHz Analog Output
−53
dBc
NARROW-BAND SFDR
1.1 MHz Analog Output (±10 kHz) −90 dBc
1.1 MHz Analog Output (±50 kHz) −88 dBc
1.1 MHz Analog Output (±250 kHz) −86 dBc
1.1 MHz Analog Output (±1 MHz) −85 dBc
15.1 MHz Analog Output (±10 kHz) −90 dBc
15.1 MHz Analog Output (±50 kHz) −87 dBc
15.1 MHz Analog Output (±250 kHz) −85 dBc
15.1 MHz Analog Output (±1 MHz)
−83
dBc
40.1 MHz Analog Output (±10 kHz) −90 dBc
40.1 MHz Analog Output (±50 kHz) −87 dBc
40.1 MHz Analog Output (±250 kHz) −84 dBc
40.1 MHz Analog Output (±1 MHz) −82 dBc
75.1 MHz Analog Output (±10 kHz) −87 dBc