AD9787 Analog Devices, AD9787 Datasheet - Page 48

• Manufacturer Part Number: AD9787
• Description: Dual 14-Bit 800 MSPS DAC with Low Power 32-Bit Complex NCO
• Manufacturer: Analog Devices

Specifications of AD9787

• Resolution (bits): 14bit
• Dac Update Rate: 800MSPS
• Dac Settling Time: n/a
• Max Pos Supply (v): +3.47V
• Single-supply: No
• Dac Type: Current Out
• Dac Input Format: Par

AD9785/AD9787/AD9788
Table 35. Typical VCO Freq Range vs. PLL Band Select Value
PLL Band Select
111111 (63)
111110 (62)
111101 (61)
111100 (60)
111011 (59)
111010 (58)
111001 (57)
111000 (56)
110111 (55)
110110 (54)
110101 (53)
110100 (52)
110011 (51)
110010 (50)
110001 (49)
110000 (48)
101111 (47)
101110 (46)
101101 (45)
101100 (44)
101011 (43)
101010 (42)
101001 (41)
101000 (40)
100111 (39)
100110 (38)
100101 (37)
100100 (36)
100011 (35)
100010 (34)
100001 (33)
100000 (32)
PLL Lock Ranges over Temperature, −40°C to +85°C
f
Auto mode
1975
1956
1938
1923
1902
1883
1870
1848
1830
1822
1794
1779
1774
1748
1729
1730
1699
1685
1684
1651
1640
1604
1596
1564
1555
1521
1514
1480
1475
1439
1435
LOW
VCO Frequency Range in MHz
(PIN 5 AND PIN 6)
REFCLK
f
Auto mode
2026
2008
1992
1977
1961
1942
1931
1915
1897
1885
1869
1853
1840
1825
1810
1794
1780
1766
1748
1729
1702
1681
1658
1639
1606
1600
1575
1553
1529
1505
1489
HIGH
PLL_LOCK (PIN 65)
PLL ENABLE
Figure 68. Clock Multiplication Circuit
DETECTION
0x04 [15]
0x09 [3]
PHASE
0x04 [12:11]
1
PLL LOOP
Rev. A | Page 48 of 64
DIVISOR
÷N
2
FILTER
LOOP
DAC CLOCK
0x04 [14:13]
PLL VCO
DIVISOR
PLL Band Select
011111 (31)
011110 (30)
011101 (29)
011100 (28)
011011 (27)
011010 (26)
011001 (25)
011000 (24)
010111 (23)
010110 (22)
010101 (21)
010100 (20)
010011 (19)
010010 (18)
010001 (17)
010000 (16)
001111 (15)
001110 (14)
001101 (13)
001100 (12)
001011 (11)
001010 (10)
001001 (9)
001000 (8)
000111 (7)
000110 (6)
000101 (5)
000100 (4)
000011 (3)
000010 (2)
000001 (1)
000000 (0)
1
÷N
The lock ranges in this table are typical values. Actual lock ranges will vary
from device to device.
0x01 [7:6]
1
÷IF
PLL Lock Ranges over Temperature, −40°C to +85°C
ADC
VCO
DATACLK (PIN 37)
DAC
INTERPOLATION
RATE
0x04 [23:21]
VCO CONTROL
VOLTAGE
f
1402
1397
1361
1356
1324
1317
1287
1282
1250
1245
1215
1210
1182
1174
1149
1141
1115
1109
1086
1078
1055
1047
1026
1019
998
991
976
963
950
935
922
911
LOW
VCO Frequency Range in MHz
f
1468
1451
1427
1412
1389
1375
1352
1336
1313
1299
1277
1264
1242
1231
1210
1198
1178
1166
1145
1135
1106
1103
1067
1072
1049
1041
1026
1011
996
981
966
951
HIGH
1